A novel green phosphor Sr8ZnY(PO4)7:Eu2+, Ln3+ (Ln = Pr, Tm, Yb) with broad emission band for high color rendering white-lighting-emitting diodes
作者：
Zhong, Yuan;Gai, Shujie;Yang, Yimei;Xia, Mao;Zhang, Ye;...
期刊：
Journal of Luminescence ,2019年214:116600 ISSN：0022-2313
通讯作者：
Zhou, Zhi
作者机构：
[Xia, Mao; Zhang, Ye; Xiang, Fang; Yang, Yimei; Zhong, Yuan; Zhou, Zhi; Qiu, Fanshan] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xia, Mao; Zhang, Ye; Xiang, Fang; Yang, Yimei; Zhong, Yuan; Gai, Shujie; Zhou, Zhi; Qiu, Fanshan] Hunan Prov Engn Technol Res Ctr Opt Agr, Changsha 410128, Hunan, Peoples R China.;[Gai, Shujie] Hunan Agr Univ, Coll Agr, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhou, Zhi] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Crystal structure;Emission spectroscopy;Light;Light emitting diodes;Phosphors;Photoluminescence;Red Shift;Thermodynamic stability;Color rendering index;Correlated color temperature;Doping concentration;Electroluminescence properties;Hydrothermal reaction;Photoluminescence properties;White LED;White light emitting diodes;Electroluminescence
摘要：
Green phosphor is an essential component in phosphor-converted white light-emitting diodes (pc-LEDs). Herein, a novel green-emitting phosphate phosphor Sr8ZnY(PO4)7:Eu2+ (SZYP:Eu2+) was synthesized through hydrothermal reaction method. The crystal structure, photoluminescence properties as well as thermal stability of SZYP:Eu2+ were investigated systematically. SZYP:Eu2+ can be efficiently excited by n-UV light in the range from 220 to 550 nm and shows a broad emission band centered at 520 nm with a full width at half maximum of 86 nm. The optimized doping concentration of Eu2+ was determined to be 0.02 mol. With the increase of Eu2+ content, a subtle red shift about 4 nm in emission spectra was detected. SZYP:Eu2+ also shows comparable thermal stability (45% at 150 °C) and it can be further varied to 44, 40 and 51% by co-doping with Pr3+, Tm3+ and Yb3+, respectively. The white LED device blended with SZYP:Eu2+ shows excellent electroluminescence (EL) properties. The low correlated color temperature (4791 K) and ultrahigh color rendering index (95.8) imply that this phosphor may find a potential application in high-quality white LEDs. © 2019 Elsevier B.V.
语种：
英文
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Double G-quadruplexes in a copper nanoparticle based fluorescent probe for determination of HIV genes
作者：
Han, Yunpeng;Zhang, Feng;Gong, Hang* ;Cai, Changqun*
期刊：
Microchimica Acta ,2019年186(1):1-8 ISSN：0026-3672
通讯作者：
Gong, Hang;Cai, Changqun
作者机构：
[Cai, Changqun; Gong, Hang; Cai, CQ; Han, Yunpeng] Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat, Minist Educ,Coll Chem, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Gong, H; Cai, CQ] X;Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat, Minist Educ,Coll Chem, Xiangtan 411105, Peoples R China.
关键词：
copper;fluorescent dye;guanine quadruplex;metal nanoparticle;virus DNA;chemistry;genetic procedures;genetics;human;Human immunodeficiency virus;Biosensing Techniques;Copper;DNA, Viral;Fluorescent Dyes;G-Quadruplexes;HIV;Humans;Metal Nanoparticles
摘要：
A DNA-templated copper nanoparticle (CuNP) probe has been developed for the determination of the human immunodeficiency virus oligonucleotide (HIV-DNA). The function of the probe relies on affinity binding-induced DNA hybridization associated with the use of double G-quadruplexes. Double-stranded DNA(dsDNA) with poly(AT-TA) bases was used as a template for synthesis of dsDNA-CuNPs. These have weak fluorescence. In the next step, two G-rich sequences that are linked to both sides of the ds-DNA are locked by HIV complementary DNA (cDNA). If HIV-DNA is introduced, it will hybridize with cDNA, thereby transforming the two G-rich sequences into G-quadruplexes. This enhances the fluorescence of the adjacent dsDNA-CuNPs. Fluorescence increases linearly in the 1 to 200 and 250–1000nM HIV-DNA concentration range, and the detection limit is 13 pM. This enzyme-free fluorometric assay is time-saving, easily operated, and therefore has large potential in biosensing because it may be extended to various other DNA targets. [Figure not available: see fulltext.]. © 2018, Springer-Verlag GmbH Austria, part of Springer Nature.
语种：
英文
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Reactions of 2-aza-21-carbaporphyrin with aniline derivatives
作者：
Ren, Demin;Liu, Bin;Li, Xiaofang* ;Koniarz, Sebastian;Pawlicki, Milosz;...
期刊：
Organic Chemistry Frontiers ,2019年6(7):908-918 ISSN：2052-4110
通讯作者：
Li, Xiaofang;Chmielewski, Piotr J.
作者机构：
[Ren, Demin] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Liu, Bin; Li, Xiaofang] Hunan Univ Sci & Technol, Sch Chem & Chem Engn, Minist Educ, Key Lab Theoret Organ Chem & Funct Mol, Xiangtan 411201, Hunan, Peoples R China.;[Koniarz, Sebastian; Pawlicki, Milosz; Chmielewski, Piotr J.] Univ Wroclaw, Dept Chem, F Joliot Curie 14, PL-50383 Wroclaw, Poland.
通讯机构：
[Li, Xiaofang] H;[Chmielewski, Piotr J.] U;Hunan Univ Sci & Technol, Sch Chem & Chem Engn, Minist Educ, Key Lab Theoret Organ Chem & Funct Mol, Xiangtan 411201, Hunan, Peoples R China.;Univ Wroclaw, Dept Chem, F Joliot Curie 14, PL-50383 Wroclaw, Poland.
关键词：
Stereochemistry;Aniline derivatives;Aromatic amines;Chloranil;One pot;One step synthesis;Organic Chemistry;Redox property;Regio-selective;Aniline
摘要：
Regioselective azotization or bis(amination) products of the title porphyrinoid were achieved in one-pot one-step syntheses under mild conditions using a selection of aromatic amines and isoamyl nitrite or p-chloranil, respectively. Structures, tautomery, chirality as well as spectroscopic and redox properties of the new systems were discussed.
语种：
英文
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Colorimetric determination of ascorbic acid and the activity of alkaline phosphatase based on the inhibition of the peroxidase-like activity of citric acid-capped Prussian Blue nanocubes
作者：
Wu, Tengteng;Hou, Wenli;Ma, Zhangyan;Liu, Meiling* ;Liu, Xiaoying* ;...
期刊：
Microchimica Acta ,2019年186(2):123 ISSN：0026-3672
通讯作者：
Liu, Meiling;Liu, Xiaoying
作者机构：
[Zhang, Youyu; Wu, Tengteng; Ma, Zhangyan; Liu, Meiling; Hou, Wenli; Yao, Shouzhuo] Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;[Liu, Xiaoying] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Liu, Meiling; Liu, Xiaoying] H;Hunan Normal Univ, Coll Chem & Chem Engn, Minist Educ, Key Lab Chem Biol & Tradit Chinese Med Res, Changsha 410081, Hunan, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
*3,3,5,5-Tetramethylbenzidine;*Colorimetric assay;*Enzyme mimic;*Inhibition;*Nanocubes;*Peroxidase mimetic;*Prussian White
摘要：
Colorimetric methods are described for the determination of ascorbic acid (AA) and alkaline phosphatase (ALP). Both assays are based on the inhibition of the peroxidase (POx)-like activity of Prussian Blue nanocubes (PB NCs) capped with citric acid. They catalyze the oxidation of 3,3,5,5-tetramethylbenzidine (TMB) by H2O2 to produce a blue color with an absorption maximum at 652 nm. On addition of AA, the PB NCs are reduced to Prussian White (PW) which does not act as a POx mimic. This results in a decreased rate of the formation of the blue coloration whose intensity decreases with increasing concentration of AA. The assay allows AA to be quantified with a 35 nM detection limit (at 3sigma/m). The hydrolysis of AA phosphate by ALP leads to the formation of AA which can be quantified by the above method. Based on this, the activity of ALP can be determined by measurement of the intensity of the blue coloration thus formed. The method can be used to determine the activity of ALP with a detection limit as low as 0.23 U.L(-1). Graphical abstract Schematic presentation of a method for colorimetric determination of ALP activity. AA obtained by ALP-catalyzed hydrolysis of ascorbic acid phosphate (AAP) inhibits the intrinsic peroxidase-like activity of PB NCs by reducing Prussian Blue nanocrystals (PB NCs) to form inactive Prussian White (PW).
语种：
英文
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Regioselectivity Control in the Oxidative Formal [3 + 2] Annulations of Ketoxime Acetates and Tetrohydroisoquinolines
作者：
Qu, Zhonghua;Zhang, Feng;Deng, Guo-Jun;Huang, Huawen*
期刊：
Organic Letters ,2019年21(20):8239-8243 ISSN：1523-7060
通讯作者：
Huang, Huawen
作者机构：
[Qu, Zhonghua; Deng, Guo-Jun; Huang, Huawen; Zhang, Feng] Xiangtan Univ, Coll Chem, Key Lab Green Organ Synth & Applicat Hunan Prov, Minist Educ,Key Lab Environm Friendly Chem & Appl, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Huang, Huawen] X;Xiangtan Univ, Coll Chem, Key Lab Green Organ Synth & Applicat Hunan Prov, Minist Educ,Key Lab Environm Friendly Chem & Appl, Xiangtan 411105, Peoples R China.
摘要：
A novel copper-catalyzed oxidative formal [3 + 2] annulations of ketoxime acetates and tetrohydroisoquinolines for the synthesis of fused pyrazoles and imidazoles has been developed. A broad range of important isoquinoline-fused pyrazole and imidazole products were selectively generated by the key control of oxidant.
语种：
英文
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Evaluation of the uptake capacities of heavy metals in Chinese cabbage.
作者：
Mi, Baobin;Liu, Feng;Xie, Lingling;Zhou, Huoqiang;Wu, Fangfang* ;...
期刊：
Ecotoxicology and Environmental Safety ,2019年171:511-517 ISSN：0147-6513
通讯作者：
Dai, Xiongze;Wu, Fangfang
作者机构：
[Dai, Xiongze; Zhou, Huoqiang; Mi, Baobin; Liu, Feng; Xie, Lingling] Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Hunan, Peoples R China.;[Wu, Fangfang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Dai, Xiongze; Wu, Fangfang] H;Hunan Acad Agr Sci, Res Inst Vegetables, Changsha 410125, Hunan, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Chinese cabbages;Food safety;Genotype difference;Heavy metals
摘要：
Heavy metal (HM) contamination in soil result in second pollution damage to Chinese cabbage, leading to deleterious health impacts. To elucidate the common transfer and accumulation characteristics of HMs in Chinese cabbage cultivar is important for safety breeding and consumption. In this case, concentrations and transfer capacities of HMs (Cd, Cr, Hg, Pb and As) in 35 common Chinese cabbage genotypes and their genotypic difference were investigated in this work. Results indicate that Chinese cabbage cultivar was more susceptible to Cd pollution, Hg was easily sifted from underground part to aerial part, Cr and Pb have similar enrichment and translocation characteristics, and Chinese cabbage cultivar had tolerance to As toxicity to some extent. Moreover, genotypic difference in HM accumulation in different parts of Chinese cabbage cultivar was also observed, and for edible part, followed by Hg>As>Cd>Pb>Cr. Referring to overall HM pollution level and biomass yield of edible part of 35 tested Chinese cabbages, B18, B6, B2 and B3 could be considered as the potential HMs pollution-safe Chinese cabbage cultivars. Information founded in this work may be used to provide referential strategies and methods to minimize the influx of HMs pollutants to human being through consumption and cultivation of Chinese cabbages. © 2019 Elsevier Inc.
语种：
英文
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Intrinsic strain-induced segregation in multiply twinned Cu-Pt icosahedra
作者：
Deng, Lei;Liu, Xunlin;Zhang, Xingming* ;Wang, Liang;Li, Wei;...
期刊：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS ,2019年21(9):4802-4809 ISSN：1463-9076
通讯作者：
Zhang, Xingming;Tang, Jianfeng
作者机构：
[Zhang, XM; Tang, Jianfeng; Deng, Lei; Li, Wei; Liu, Xunlin; Wang, Liang; Song, Mingke; Zhang, Xingming] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Deng, Huiqiu; Hu, Wangyu] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China.;[Xiao, Shifang] Hunan Univ, Sch Phys & Elect, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Zhang, XM; Tang, JF] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
摘要：
We present an atomistic simulation study on the compositional arrangements throughout Cu-Pt icosahedra, with a specific focus on the effects of inherent strain on general segregation trends. The coexistence of radial and site-selective segregation patterns is found in bimetallic nanoparticles for a broad range of sizes and compositions, consistent with prior analytical and atomistic models. Through a thorough comparison between the composition patterns and strain-related patterns, it is suggested that the presence of gradient and site-selective segregation is natural to largely relieve the inherent strain by preferential segregation of big atoms at tensile sites and vice versa, as previously hypothesized in the literature. Analogous to the case of single crystal particles, Cu-rich surface and damped oscillations can also be found in the outer shells of icosahedra, which are dominated by the lowering of both the surface energy and the chemical energy. The thermodynamic stability of segregated icosahedra is similar to segregated cuboctahedra but higher than disordered bulk alloys, validating prior thinking that element segregation driven by strain relief can extend the stability range of multiply-twinned nanoparticles. Our work sheds new light on understanding strain-induced segregation in multiply-twinned nanosystems that have elements with large lattice mismatch and strong alloying ability. © the Owner Societies.
语种：
英文
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High-performance and moisture-resistant red-emitting Cs 2 SiF 6 :Mn 4+ for high-brightness LED backlighting
作者：
Liu, Yong;Zhou, Zhi* ;Huang, Lin;Brik, Mikhail G.;Si, Shuaichen;...
期刊：
Journal of Materials Chemistry C ,2019年7(8):2401-2407 ISSN：2050-7526
通讯作者：
Wang, Jing;Zhou, Zhi;Qiu, Jianbei
作者机构：
[Lin, Litian; Si, Shuaichen; Xuan, Tongtong; Liu, Yong; Huang, Lin; Wang, Jing; Liang, Hongbin] Sun Yat Sen Univ, Key Lab Bioinorgan & Synthet Chem, State Key Lab Optoelect Mat & Technol, Sch Chem,Minist Educ, Guangzhou 510275, Guangdong, Peoples R China.;[Zhou, Zhi] Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 410128, Hunan, Peoples R China.;[Brik, Mikhail G.] Chongqing Univ Posts & Telecommun, Coll Sci, Chongqing 400065, Peoples R China.;[Brik, Mikhail G.] Univ Tartu, Inst Phys, W Ostwald Str 1, EE-50411 Tartu, Estonia.;[Brik, Mikhail G.] Jan Dtugosz Univ, Inst Phys, Armii Krajowej 13-15, PL-42200 Czestochowa, Poland.
通讯机构：
[Wang, Jing] S;[Zhou, Zhi] H;[Qiu, Jianbei] K;Sun Yat Sen Univ, Key Lab Bioinorgan & Synthet Chem, State Key Lab Optoelect Mat & Technol, Sch Chem,Minist Educ, Guangzhou 510275, Guangdong, Peoples R China.;Hunan Agr Univ, Coll Sci, Hunan Opt Agr Engn Technol Res Ctr, Changsha 410128, Hunan, Peoples R China.
关键词：
Color;Fluorine compounds;Light emission;Luminance;Moisture;Phosphors;Precipitation (chemical);Coprecipitation method;Emission intensity;External quantum efficiency;High brightness LEDs;High luminous efficacy;Moisture resistance;Moisture stability;Red emitting phosphor;Light emitting diodes
摘要：
Narrow-band red-emitting fluoride phosphors for wide color gamut LED backlights have evoked considerable attention, due to their fascinating optical properties. Unfortunately, poor moisture resistance often restricts their further applications in optoelectronics. Herein we developed a Cs 2 SiF 6 :Mn 4+ red phosphor using a lowerature co-precipitation method and passivating it by using H 2 O 2 . The phosphor shows a very high external quantum efficiency (EQE) of ∼85% and exhibits excellent moisture stability retaining 74% of its emission intensity after being exposed to high temperature (85 °C) and high humidity (85%) (HTHH) for 168 h. Finally, the high brightness white LED devices combined with the passivated Cs 2 SiF 6 :Mn 4+ exhibit high luminous efficacy of 133 lm W -1 and wide color gamut (∼84.7% NTSC). The results demonstrate that the passivated Cs 2 SiF 6 :Mn 4+ with high EQE and excellent moisture-resistance is promising as a narrow-band red emitting phosphor for wide color gamut LED backlights. © 2019 The Royal Society of Chemistry.
语种：
英文
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Regio- and stereo-selective decarbonylative alkylative arylation of terminal alkynes with aliphatic aldehydes and arenes via dual C–H bond functionalization
作者：
Peng, Yong;Zhang, Feng;Qin, Ting-Ting;Xu, Cong-Ling;Yang, Luo*
期刊：
Organic Chemistry Frontiers ,2019年6(20):3597-3602 ISSN：2052-4110
通讯作者：
Yang, Luo
作者机构：
[Peng, Yong; Yang, Luo; Qin, Ting-Ting; Zhang, Feng; Xu, Cong-Ling] Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environmentally Friendly Chem & Applicat, Coll Chem,Minist Educ, Xiangtan 411105, Hunan, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Yang, Luo] X;Xiangtan Univ, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environmentally Friendly Chem & Applicat, Coll Chem,Minist Educ, Xiangtan 411105, Hunan, Peoples R China.
关键词：
Aldehydes;Aromatic hydrocarbons;Chemical reactions;Aliphatic aldehydes;Alkyl radicals;Arylations;C-h bond functionalization;Radical addition;Stereo-selective;Terminal alkyne;Three component;Copper compounds
摘要：
A convenient Cu-promoted three-component decarbonylative alkylative arylation of terminal alkynes with aliphatic aldehydes and arenes is developed to provide chain elongated tri-substituted olefins with good chemo-, regio- and stereo-selectivities, and is applied to the radical-type decarbonylative coupling of sugar analogs. Readily available aliphatic aldehydes are readily decarbonylated into 1, 2 and 3 alkyl radicals for the construction of a C(sp3)-C(sp2) bond via radical addition, followed by HAS-arylation to form the C(sp2)-C(sp2) bond. © the Partner Organisations.
语种：
英文
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Nickel-Catalyzed Chemoselective Asymmetric Hydrogenation of α,β-Unsaturated Ketoimines: An Efficient Approach to Chiral Allylic Amines
作者：
Zhao, Xiang;Zhang, Feng;Liu, Kai;Zhang, Xumu;Lv, Hui*
期刊：
Organic Letters ,2019年21(22):8966-8969 ISSN：1523-7060
通讯作者：
Lv, Hui
作者机构：
[Zhao, Xiang; Liu, Kai; Lv, Hui] Wuhan Univ, Minist Educ, Key Lab Biomed Polymers, Wuhan 430072, Hubei, Peoples R China.;[Zhao, Xiang; Liu, Kai; Lv, Hui] Wuhan Univ, Coll Chem & Mol Sci, Engn Res Ctr Organosilicon Cpds & Mat, Minist Educ,Sauvage Ctr Mol Sci, Wuhan 430072, Hubei, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Lv, Hui] Chinese Acad Sci, CAS Key Lab Mol Recognit & Funct, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China.;[Zhang, Xumu] Southern Univ Sci & Technol, Shenzhen Grubbs Inst, Shenzhen 518055, Guangdong, Peoples R China.
通讯机构：
[Lv, Hui] W;[Lv, Hui] C;Wuhan Univ, Minist Educ, Key Lab Biomed Polymers, Wuhan 430072, Hubei, Peoples R China.;Wuhan Univ, Coll Chem & Mol Sci, Engn Res Ctr Organosilicon Cpds & Mat, Minist Educ,Sauvage Ctr Mol Sci, Wuhan 430072, Hubei, Peoples R China.;Chinese Acad Sci, CAS Key Lab Mol Recognit & Funct, Inst Chem, Beijing Natl Lab Mol Sci, Beijing 100190, Peoples R China.
摘要：
An efficient synthetic route to chiral allylic amines has been developed by nickel/(S,S)-Ph-BPE complex catalyzed chemoselective asymmetric hydrogenation of α,β-unsaturated ketoimines. Varieties of α,β-unsaturated ketoimines have been well tolerated in this transformation to give chiral allylic amines with high yields and excellent ee values (up to 99% yield, up to 99% ee). A gram-scale reaction with 0.2 mol % catalyst loading has also been achieved. © 2019 American Chemical Society.
语种：
英文
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微信辅助BOPPPS教学模型在有机化学课程教学中的应用研究
作者：
李霞;文志勇;李宇;张薇;董新容
期刊：
科技经济导刊 ,2019年(24):112-113 ISSN：2096-1995
作者机构：
湖南农业大学理学院
关键词：
BOPPPS教学模型;微信;有机化学课程
摘要：
以湖南农业大学"有机化学"课程为例,分析传统教学在新教学模式下存在的问题,结合BOPPPS教学模型,进行微信辅助有机化学课程教学方面的研究。
语种：
中文
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Chemoselective metal-free indole arylation with cyclohexanones
作者：
Lu, Chaogang;Huang, Huawen* ;Tuo, Xiaolong;Jiang, Pingyu;Zhang, Feng;...
期刊：
Organic Chemistry Frontiers ,2019年6(15):2738-2743 ISSN：2052-4110
通讯作者：
Huang, Huawen;Deng, Guo-Jun
作者机构：
[Jiang, Pingyu; Deng, Guo-Jun; Huang, Huawen; Deng, GJ; Lu, Chaogang; Tuo, Xiaolong; Zhang, Feng] Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Huang, HW; Deng, GJ] X;Xiangtan Univ, Coll Chem, Minist Educ, Key Lab Environm Friendly Chem & Applicat, Xiangtan 411105, Peoples R China.
关键词：
Chemical reactions;Arylations;Chemoselective;Cyclohexanones;Elemental sulfur;Metal free;Polycyclic aromatic hydrocarbons
摘要：
Herein, we have revealed elemental sulfur-and iodine reagent-mediated indole C3 arylations using cyclohexanones as the arylating reagent. This protocol provides an efficient gram-scalable access to 3-Arylindole and benzo[4,5]thieno[2,3-b]indole motifs with a broad range of compatible functionalities. © the Partner Organisations.
语种：
英文
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Iron-Promoted Three-Component 2-Substituted Benzothiazole Formation via Nitroarene ortho-C–H Sulfuration with Elemental Sulfur
作者：
Xing, Qiaoyan;Ma, Yanfeng;Xie, Hao;Xiao, Fuhong;Zhang, Feng* ;...
期刊：
JOURNAL OF ORGANIC CHEMISTRY ,2019年84(3):1238-1246 ISSN：0022-3263
通讯作者：
Zhang, Feng;Deng, Guo-Jun
作者机构：
[Ma, Yanfeng; Xing, Qiaoyan; Zhang, Feng; Deng, GJ; Xie, Hao; Deng, Guo-Jun; Xiao, Fuhong] Xiangtan Univ, Coll Chem, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat,Minist, Xiangtan 411105, Peoples R China.;[Zhang, Feng] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhang, F; Deng, GJ] X;[Zhang, Feng] H;Xiangtan Univ, Coll Chem, Key Lab Green Organ Synth & Applicat Hunan Prov, Key Lab Environm Friendly Chem & Applicat,Minist, Xiangtan 411105, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
Chemical bonds;Sulfur;2-substituted benzothiazole;Benzothiazoles;C-s bond formations;Elemental sulfur;Nitroarenes;Sequential assembly;Sulfur powders;Three component;Iron;alcohol derivative;aromatic nitro compound;benzothiazole derivative;iron;nitrobenzene derivative;nitroreductase;sulfur;alcohol oxidation;Article;chemical bond;controlled study;reaction analysis;regioselectivity
摘要：
A three-component procedure for the preparation of 2-substituted benzothiazoles from nitroarenes, alcohols, and sulfur powder is described. The reaction showed a good functional group tolerance to provide the heterocyclic products in moderate to good yields. The sequential assembly involving nitro reduction, C-N condensation, and C-S bond formation has been realized in one pot. Copyright © 2019 American Chemical Society.
语种：
英文
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Facile preparation of robust porous MoS2/C nanosheet networks as anode material for sodium ion batteries
作者：
Zhang, Rui;Li, Huiyong;Sun, Dan;Luan, Jingyi;Huang, Xiaobing;...
期刊：
Journal of Materials Science ,2019年54(3):2472-2482 ISSN：0022-2461
通讯作者：
Wang, Haiyan
作者机构：
[Wang, Haiyan; Luan, Jingyi; Sun, Dan; Zhang, Rui; Tang, Yougen] Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Hunan Prov Key Lab Chem Power Sources, Changsha 410083, Hunan, Peoples R China.;[Li, Huiyong] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Huang, Xiaobing] Hunan Univ Arts & Sci, Coll Chem & Chem Engn, Changde 415000, Peoples R China.
通讯机构：
[Wang, Haiyan] C;Cent S Univ, Coll Chem & Chem Engn, Hunan Prov Key Lab Efficient & Clean Utilizat Man, Hunan Prov Key Lab Chem Power Sources, Changsha 410083, Hunan, Peoples R China.
关键词：
Anodes;Layered semiconductors;Metal ions;Molybdenum compounds;Nanosheets;Sodium chloride;Sodium-ion batteries;Surface reactions;Conductive networks;Electrochemical performance;Facile preparation;High reversible capacities;Nanosheet networks;Rate capabilities;Reversible capacity;Three-dimensional networks;Sulfur compounds
摘要：
Developing advanced MoS2 anode material for sodium ion battery is still a big challenge since it is hindered by poor cycling stability and rate capability owing to huge volume variation during charge/discharge processes and low conductivity. In this work, three-dimensional porous networks consisting of several-layered MoS2/C nanosheets are synthesized via a facile freeze-drying approach using NaCl as template. MoS2/C nanosheet networks demonstrate a high reversible capacity of 389mAhg−1 and maintain 370mAhg−1 after 100 cycles at 100mAg−1, indicating excellent cycling stability. Good rate properties are also achieved with reversible capacities of 292, 256, 223, 174mAhg−1 at 1, 2, 4, 6Ag−1, respectively. The excellent electrochemical performance can be ascribed to the unique three-dimensional networks consisting of few-layered MoS2 nanosheets, which facilitates sodium ion diffusion via near-surface reaction. Moreover, the robust three-dimensional carbon matrix can not only provide a conductive network, but also buffer the strain and maintain the electrode integrity during repeated sodiation/desodiation process. This strategy presents a new path for fabricating low-cost and high-yield three-dimensional metal sulfide (phosphide)/carbon composites for applications in energy-related fields and beyond. © 2018, Springer Science+Business Media, LLC, part of Springer Nature.
语种：
英文
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浅谈有机化学知识在高分子化学教学中的高效融合
作者：
张凤;盛浩
期刊：
山东化工 ,2019年48(18):193-194 ISSN：1008-021X
作者机构：
湖南农业大学理学院,湖南 长沙,410128;湖南农业大学资源与环境学院,湖南 长沙,410128;[张凤; 盛浩] 湖南农业大学
关键词：
有机化学;高分子化学;高分子合成;高分子改性
摘要：
有机化学是高分子化学课程之前重要的先修课程,为高分子材料合成提供了理论基础。在高分子化学教学过程中,结合有机化学知识,有利于帮助学生克服畏难心理,提高学生学习兴趣,加快学生对重点难点的理解,从而达到更好的教学效果。笔者结合十年高分子化学和有机化学的课堂教学经验,简要介绍在高分子化学课程教学中进行相关的有机化学知识有效融合的一些做法和心得体会。
语种：
中文
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博落回茎叶血根碱提取工艺的比较研究
作者：
曹华亮;曾建国;董新荣;谢红旗
期刊：
饲料工业 ,2019年40(14):31-40 ISSN：1001-991X
作者机构：
湖南农业大学中兽药湖南省重点实验室,湖南长沙410128;湖南农业大学园艺园林学院,湖南长沙410128;湖南美可达生物资源股份有限公司,湖南浏阳410331;湖南农业大学理学院,湖南长沙,410128;湖南农业大学园艺园林学院,湖南长沙,410128
关键词：
博落回茎叶;血根碱;回流提取;渗漉提取;响应面;正交试验
摘要：
为博落回提取血根碱开发新原料,为工业化生产提供依据.在单因素试验的基础上,以血根碱转移率为评价指标,分别对博落回茎叶使用酸性乙醇回流和酸水渗漉法进行工艺研究.试验结果表明酸性乙醇回流提取工艺最佳条件为乙醇体积分数90%,液固比30:1 ml/g,硫酸浓度0.12%,提取温度80 ℃,提取时间2 h,血根碱转移率达到(89.36±0.49)%(n=5, R2=0.54%),最终得到博落回茎叶提取物收率(24.27±0.92)%(n=5,R2=3.77%),血根碱含量(1.65±0.06)%(n=5,R2=3.36%);酸水渗漉提取工艺最佳条件为硫酸浓度1%,浸泡时间30 min,渗漉温度80 ℃,溶剂用量30倍,渗漉速度0.5 ml/min,血根碱转移率达到(83.63 ± 2.09)% (n=5,R2=2.49% ),最终得到博落回茎叶提取物收率(21.64±0.78)%(n=5,R2=3.61%),血根碱含量(2.25±0.11)%(n=5,R2=4.88%).两种提取方法中酸水渗漉法碱沉步骤简便,得到的提取物中血根碱的含量比酸性乙醇回流法高出36.36%,溶剂用量一致,在工业化生产中应结合实际情况进一步优化参数条件,为博落回茎叶开发利用提供了理论依据.
语种：
中文
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A new member of the CoO structure family: Hexagonal prisms CoO assembled on reduced graphene oxide for high-performance lithium-ion storage capacity
作者：
Bao, Lin;He, Yikuan;Peng, Chang;Li, Yan* ;Ou, Encai* ;...
期刊：
Materials Letters ,2019年235(Jan.15):88-91 ISSN：0167-577X
通讯作者：
Li, Yan;Ou, Encai;Xu, Weijian
作者机构：
[Bao, Lin; Li, Yan] Northwest Univ, Coll Chem & Mat Sci, Energy & Catalysis Hub, Minist Educ,Key Lab Synthet & Nat Funct Mol Chem, Xian 710127, Shaanxi, Peoples R China.;[Xu, Weijian; He, Yikuan; Ou, Encai; Xu, WJ] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemobiosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.;[Peng, Chang] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Li, Yan] N;[Ou, EC; Xu, WJ] H;Northwest Univ, Coll Chem & Mat Sci, Energy & Catalysis Hub, Minist Educ,Key Lab Synthet & Nat Funct Mol Chem, Xian 710127, Shaanxi, Peoples R China.;Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemobiosensing & Chemometr, Changsha 410082, Hunan, Peoples R China.
关键词：
Anodes;Cobalt compounds;Electrochemistry;Graphene;Ions;Prisms;Sol-gel process;Sol-gels;Cobalt oxides;Electrochemical test;Hexagonal morphology;Hexagonal prism;Lithium ion storages;Modified sol-gel method;Pure phase;Reduced graphene oxides;Lithium-ion batteries
摘要：
In this research, we use a modified sol-gel method to obtain a pure phase new hexagonal CoO on reduced graphene oxide by leading of polar solvent. In the electrochemical test, the CoO/rGO composite shows a remarkable performance of capacity as an anode of a lithium ion battery. The electrochemistry performance shows that the capacity of the composite can remain at 1300 mAh/g in 100 cycles without damping. The pure phase of CoO and its hexagonal morphology have been characterized by XRD, SEM and TEM. (C) 2018 Elsevier B.V. All rights reserved.
语种：
英文
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Multi-gram scale synthesis of a bleomycin (BLM) carbohydrate moiety: exploring the antitumor beneficial effect of BLM disaccharide attached to 10-hydroxycamptothecine (10-HCPT)
作者：
Li, MaoLin;Huang, Weiping;Jiang, Zhilin;Shi, Yonghui;Yuan, Sisi;...
期刊：
NEW JOURNAL OF CHEMISTRY ,2019年43(15):6010-6020 ISSN：1144-0546
通讯作者：
Zhou, Wen;Zhou, Li
作者机构：
[Fu, Kaishuo; Yuan, Sisi; Zhou, Wen; Huang, Weiping; Li, MaoLin] Guangzhou Univ Chinese Med, Sch Pharmaceut Sci, Waihuan Rd, Guangzhou 510006, Guangdong, Peoples R China.;[Jiang, Zhilin] Puer Univ, Puer, Yunan, Peoples R China.;[Shi, Yonghui] Sun Yat Sen Univ, Sun Yat Sen Mem Hosp, Dept Pharm, Guangzhou 510120, Guangdong, Peoples R China.;[Chen, YongJun] Guangzhou Univ Chinese Med, South China Res Ctr Acupuncture & Moxibust, Med Coll Acu Moxi & Rehabil, Waihuan Rd, Guangzhou 510006, Guangdong, Peoples R China.;[Zhou, Li] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
通讯机构：
[Zhou, Wen] G;[Zhou, Li] H;Guangzhou Univ Chinese Med, Sch Pharmaceut Sci, Waihuan Rd, Guangzhou 510006, Guangdong, Peoples R China.;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
10 hydroxycamptothecin;bleomycin;dibutyltin;disaccharide;galactoside;aminolysis;antineoplastic activity;Article;carbohydrate analysis;controlled study;deacetylation;drug conjugation;drug selectivity;drug synthesis;glycosidation;HCT 116 cell line;HEK293T cell line;Hep-G2 cell line;human;human cell;IC50;in vitro study;priority journal
摘要：
The “tumor-seeking” role of bleomycin (BLM) disaccharide has been demonstrated to serve as a promising tool for cancer diagnosis and a potential ligand for targeted therapy. However, these practical applications are often hampered by the lack of BLM disaccharide. Herein, an efficient multi-gram synthesis of peracetylated BLM disaccharide 20 is achieved by a TMSOTF-mediated glycosidation coupling manner in 43.6% overall yield in terms of benzyl galactoside. The critical innovation of the synthetic strategy is that inexpensive benzyl galactoside was first adopted to prepare an l-gulose subunit 3 as a glycosyl acceptor, with a much shorter route in 73.0% yield, and a 3-O-carbamoyl-mannose donor 4 was achieved in 47.2% yield by lowering the amount of dibutyltin oxide, and merging aminolysis and selective deacetylation into a one-pot reaction. Next, the incorporation of BLM disaccharide into 10-hydroxycamptothecin (10-HCPT), a non-specific model compound, to form conjugate 1 could significantly improve the antitumor activity and display obvious selectivity toward cancerous and normal cells in comparison with 10-HCPT. Moreover, BLM disaccharide itself was non-cytotoxic, clearly indicating the importance and potential of BLM disaccharide in solving the targeted antitumor therapy of cytotoxic drugs. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
语种：
英文
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A NECESSARY CONDITION FOR CERTAIN INTEGRAL EQUATIONS WITH NEGATIVE EXPONENTS
作者：
Xu, Jiankai* ;Tan, Zhong;Wang, Weiwei;Xiong, Zepeng
期刊：
数学物理学报 ,2019年39(1):284-296 ISSN：1003-3998
通讯作者：
Xu, Jiankai
作者机构：
[Xu, Jiankai] Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;[Xu, Jiankai] Hunan Agr Univ, Coll Comp Sci, Changsha 410128, Hunan, Peoples R China.;[Tan, Zhong] Xiamen Univ, Sch Math Sci, Xiamen 361005, Peoples R China.;[Wang, Weiwei] Fuzhou Univ, Coll Math & Comp Sci, Fuzhou 361000, Fujian, Peoples R China.;[Xiong, Zepeng] First Middle Sch Longhui, Longhui 422200, Peoples R China.
通讯机构：
[Xu, Jiankai] H;Hunan Agr Univ, Coll Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Coll Comp Sci, Changsha 410128, Hunan, Peoples R China.
关键词：
integral equations;Lane-Emden system;conformal invariance;positive solutions;existence
摘要：
This paper is devoted to studying the existence of positive solutions for the following integral system
$$\left\{ {\begin{array}{*{20}{c}}
{u\left( x \right) = \int_{{\mathbb{R}^n}} {{{\left| {x - y} \right|}^\lambda }{v^{ - q}}\left( y \right)dy,} } \\
{v\left( x \right) = \int_{{\mathbb{R}^n}} {{{\left| {x - y} \right|}^\lambda }{u^{ - p}}\left( y \right)dy,} }
\end{array}} \right.p,q > 0,\lambda \in \left( {0,\infty } \right),n \geqslant 1$$
. It is shown that if (u, v) is a pair of positive Lebesgue measurable solutions of this integral system, then
$$\frac{1}{{p - 1}} + \frac{1}{{q - 1}} = \frac{\lambda }{n}$$
, which is different from the well-known case of the Lane-Emden system and its natural extension, the Hardy-Littlewood-Sobolev type integral equations.
语种：
英文
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探索化学专业本科生科研意识与科研能力的培养模式
作者：
周智;罗伟;周南
期刊：
化工时刊 ,2019年33(05):53-54 ISSN：1002-154X
作者机构：
湖南农业大学理学院,湖南长沙,410128;[罗伟; 周南; 周智] 湖南农业大学
关键词：
本科生;化学专业;科研意识;科研能力
摘要：
现阶段的本科教育缺乏对学生科研意识与能力的培养.本人从事化学本科教育多年,发现化学专业的本科生对科研缺乏理解,缺少主动的科研精神和动手意愿.针对这一问题,本文提出了从培养学生的主观能动性,加强理论知识学习,提升动手能力、强化实际操作,培养学生的耐心和自信心,拓展大学生的创新能力等五个方面对本科生的科研意识与能力进行教育,激发本科生的科研兴趣,提升科研能力,为今后本科生进一步的发展打下良好基础.
语种：
中文
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