检索结果-南通市图书馆

Microwave-assisted synthesis,crystal structure and toxicity of L-aspartic acid zinc spiral linear supramolecular polymer

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2004年第4期47卷 295-300页

作者： ZHANG Youming LIN Qi wei taibao College of Chemistry and Chemical Engineering Gansu Key Laboratory of Polymer Materials Northwest Normal University Lanzhou730070China College of Chemistry and Chemical Engineering Gansu Key Laboratory of Polymer Materials Northwest Normal University Lanzhou730070China College of Chemistry and Chemical Engineering Gansu Key Laboratory of Polymer Materials Northwest Normal University Lanzhou730070China

L-aspartic acid zinc was synthesized by a rapid and convenient method in high yield under microwave conditions, and its single crystal structure was analyzed by X-ray diffraction. The structure unit of the title compound is [Zn(L-Asp)(H2O)2]·H2O, which is a bicyclo-complex forming a spiral linear polymer via coordination bonds. The spiral linear polymers are assembled as a three-dimensional supramolecule by intermolecular hydrogen bonds. The crystal belongs to the orthorhombic crystal system, P2(1)2(1)2(1) space group, a=0.7830(3) nm, b=0.9369(4) nm, c=11.599(5) nm, α=β=γ=90.00°, V=0.8509(6) nm3, Z=4, Dc=1.955 g/cm3, F(000)=512, μ=2.289. The toxicity of the title compound is lower than that of glutamic acid zinc and zinc sulfate. Keywords L-aspartic acid - zinc - microwave - supramolecule - toxicity

关键词： L-aspartic acid zinc microwave supramolecule toxicity

Phase Transfer Catalyzed Synthesis of Thiosemicarbazide Derivatives of 2-ethoxybenzoic Acid

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2001年第Z1期17卷 192-193页

作者： wei taibao Department of Chemistry Northwest Normal UniversityLanzhou

A series of 1,4-disubstitued thiosemicarbazides and their related heterocyclic compounds have been found to possess important biological activities[1]. Some thiosemicarbazides have been found to be useful as herbicides, insecticides and plant-growth regulators [1]. In view of these and in continuation of our earlier work on the synthesis and biological activity of thiosemicarbaides derivatives [2], we now report a convenient and efficient method for the preparation of thiosemicarbazides derivatives of 2-ethoxybenzoic acid under the condition of solid-liquid phase transfer catalysis using PEG-400 as the catalyst.

关键词： phase transfer catalysis heterocyclic compounds biological activities biological activity efficient method

An Efficient Synthesis of Polymethylene-bis-aroyl Thiourea Derivatives under the Condition of Phase Transfer Catalysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2001年第Z1期17卷 194-195页

作者： wei taibao Department of Chemistry Northwest Normal University

A number of 1,3-disubstituted derivatives are associated with various types of biological activity [1]. Some thioureas are useful as herbicides, insecticides and plant-growth regulators. Treatment of acylisothiocyanates, prepared from aroyl chlorides (0.0431mol) and potassium thiocyanate (33ml ofa 33% KSCN solution) using tetrabutylammonium bromides as a catalyst, were treated with aniline to yield the corresponding thioureas. However, probable hydrolysis of the aroyl chlorides led to decreased yields. The reaction of acid chlorides with different phenylthioureas or N1-acetyl-N3-arylthioureas requires high temperature and long reaction times. None of the other reported methods proved satisfactory. As a continuation of our earlier work on the biological activity of these compounds, [2-5] we now report acid chlorides are quantitatively converted to the acylisothiocyanates under solid-liquid phase-transfer conditions using PEG-400 as the catalyst. Treatment of these isothiocyanates with polymethylenediamines provides compounds 3 in high yields (scheme 1). The results were summarized in table 1.

关键词： Phase Transfer Catalysis Thiourea Derivatives biological activity acid chlorides high temperature

Fabricating a novel supramolecular light-activated platform based on internal-driven forces induced by the UV-light

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第12期33卷 5065-5068页

作者： Xiaoni Qi weichun Li Bingbing Shi Youming Zhang Hong Yao Qi Lin taibao wei Key Laboratory of Eco-Environmental Polymer Materials of Gansu Province College of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China

Recently,exploiting a novel supramolecular fabrication pathway have drawn great *** this endeavor,we firstly designed and reported an original light-activated platform based on the internal-driven forces of macrocyclic host by hiring the pillar[5]arene as the host molecule(H)and phenazine derivatives acting as an energetic guest molecule(G).Surprisingly,after adding the H solution into G system,the intensive fluorescence emission of the G molecule rapidly decreased under the irradiation of the UV-light(254 nm)until absolutely ***,different from the traditional supramolecular host-guest interaction,the fluorescent emission of G molecule could be recovered after irradiating under the nature *** view of this interesting observations,the interaction mechanism was carefully investigated by a series of *** results suggested that the G molecule was easily threaded into the macrocyclic cavity(H)under the internal-driven forces induced by the UV-light irradiation,forming a 1:1 host-guest ***,taking advantage of this especial feature,the light-activated platform of host-guest complex was further applied for ink-free light-driven printing materials,exhibiting great potential in the real application.

关键词： Light-activated platform Pillararene Phenazine derivatives Internal-driven forces UV-light

A Highly Selective Colorimetric Sensor for Cu^2＋ Based on Phenolic Group Biscarbonyl Hydrazone

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2013年第2期31卷 271-276页

作者： Junjian Li Ying Guo Hong Yao Qi Lin Yongqiang Xie taibao wei Youming Zhang Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education of China Key Laboratory of Polymer Materials of Gansu Province College of Chemistry and Chemical Engineering Northwest Normal University Lanzhou Gansu 730070 China

A novel copper selective sensor 2 based on hydrazide and salicylaldehyde has been designed and prepared. Sensor 2 behaves a single selectivity and sensitivity in the recognition for Cu2＋ over other metal ions such as Fe3＋, Hg2＋, Ag＋, Ca2＋, Zn2＋, Pb2＋, Cd2＋, Ni2＋, Co2＋, Cr3＋ and Mg2＋ in DMSO. The distinct color change and the rapid changement of fluorescence emission provide naked-eyes detection for Cu2＋. The UV-vis data indicate that 1 ： 2 stoichiometry complex is formed by sensor 2 and Cu2＋. The association constant Ks was 3.51 × 104 mol 1%. The detection limitation of Cu2＋ with the sensor 2 was 2.2 × 10.7 mol·L^-1. The sensing of Cu2＋ by this sensor was found to be reversible, with the Cu2＋-induced color being lost upon addition of EDTA.

关键词： copper ion colorimetric sensor biscarbonyl hydrazone single selectivity

A Turn-On Fluorescence Chemosensor for Cyanide in Aqueous Media Based on a Nucleophilic Addition Reaction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2017年第7期35卷 1165-1169页

作者： Jie Chen Wenting Li Qiao Li Qi Lin Hong Yao Youming Zhang taibao wei Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education of ChinaKey Laboratory of Polymer Materials of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhouGansu 730070China

We synthesized a new cyanide （CN-） chemosensor CX based on a nucleophilic addition reaction prompted by cyanide ion, which could be used for highly selective and sensitive fluorescence turn-on detection of cyanide in aqueous media. The CX showed selective fluorescence recognition for CN-, the miscellaneous competitive anions （F-, Cl-, Br-, I-, AcO-, H2PO4, HSO4, ClO4, S2-, PO4^3-, CO3^2- and SCN- ） did not lead to any significant interference. The detection limit of the sensor towards CN is 1.15 × 10^-7 mol.L- 1. The sensor has been successfully applied to estimate the cyanide ion in seeds of cherries. Test strips based on CX were fabricated, which could be used as a convenient and efficient CN test kit to detect CN in aqueous solution for ＂in-the-field＂ measurement.

关键词： cyanide fluorescent chemosensor test kits seeds of cherries

Sensitive and Selective Fluorescent and Colorimetric Sensor for Ag^＋ Based on the Supramolecular Self-Assembly in Semi-Water

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2017年第8期35卷 1311-1316页

作者： taibao wei Haili Zhang Wenting Li Wenjuan Qu Junxia Su Qi Lin Youming Zhang Hong Yao Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education of ChinaKey Laboratory of Polymer Materials of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhouGansu 730070China

Specific recognition of ultratrace levels of ions in semi-water using super-quicker methods is still a challenge for environmental monitoring. Herein we report a fluorescent and colormetric sensor （ZH） based on supramolecular self-assembly, whose structure was destroyed by the addition of ultratrace of silver ions. The process promoted either naked eye visible color changes or fluorescence intensity quenched in conjunction with a wide pH range. Systematic studies revealed very high selectivity （0.07 μmol/L） for silver ions, and other common cations, e.g., Hg^2＋, Cu^2＋, Cd^2＋, Pb^2＋ had nearly no influence on the sensing behavior. This sensor also served as a multiple use of component in sensing materials by addition of I^- into the mixture of ZH and Ag^＋（about 5 times）. What＇s more, ZH containing filter paper emerged distinct color and fluorescence changes upon exposure to silver （Ag^＋）, which could be used as a portable method to undertake field testing for Ag^＋.

关键词： supramolecular self-assembly silver (Ag^+) dual-channel aqueous solution

A highly selective colorimetric sensor for Hg^(2+) based on a copper (Ⅱ) complex of thiosemicarbazone in aqueous solutions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2013年第7期56卷 923-927页

作者： wei taibao LI JunJian BAI CuiBing LIN Qi YAO Hong XIE YongQiang ZHANG YouMing Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education of China Key Laboratory of Polymer Materials of Gansu Province College of Chemistry and Chemical Engineering Northwest Normal University

By applying an indirect strategy, a new copper （II） complex of a thiosemicarbazone L has been successfully developed as a colorimetric cbemosensor for the sensitive detection of mercury （II） ions. In the presence of copper （II） ions, the colorless so- lution of L became yellow; however, upon the addition of traces of mercury （II） ions, the yellow color faded to colorless im- mediately. Other ions, including Fe3＋, Ag＋, Ca2＋, Zn2＋, Pb2＋, Cd2＋, Ni2＋, Co2＋, Cr3＋ and Mg2＋ had a negligible influence on the probe behavior. The detection limits were 5.0×10^-6 M and 3.0×10^-7 M of Hg2＋ using the visual color changes and UV-vis changes respectively. Test strips based on Cu-L were fabricated, which could act as a convenient and efficient Hg2＋ test kits.

关键词： copper complex colorimetric sensor mercury cation aqueous solutions

Novel Fluorescent Chemosensor for Detection of F- Anions Based on a Single Functionalized Pillar[5]arene Iron（Ⅲ） Complex

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2016年第12期34卷 1263-1267页

作者： Youming Zhang Junxia Su Qiao Li Wenting Li Guoyan Liang Hui Li Haixia Ma Qi Lin Hong Yao taibao wei Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education of ChinaKey Laboratory of Polymer Materials of Gansu ProvinceCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhouGansu 730070China

Novel fluorescent chemosensor with good selectivity for F- anion was designed and synthesized. The sensor has a bearing on a single functionalized pillar[5]arene and Fe3＋ metal complex （PN-Fe）, which showed prominent fluorescent response for F anion over other common anions （CF, Br-, V, AcO-, HSO4-, H2PO4-, C104-, CN- and SCN-）. These results were evaluated by fluorescent method. The detection limit of PN-Fe to F was calculated to be 2.50 ×10^-7 mol/L. Moreover, the sensor PN-Fe^3＋ might serve as a recyclable component in sensing materials.

关键词： pillararene ferric(III) complex chemosensor fluoride