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Immobilization of pyrene on quartz plate surface via a flexible long spacer and its sensing properties to dicarboxylic acids

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Science China Chemistry 2004年第3期47卷 240-250页

作者： GAO Lining FANG Yu Lü Fengting DING Liping School of Chemistry and Materials Science Shaanxi Normal University Xi'an 710062 China School of Chemistry and Materials Science Shaanxi Normal University Xi'an 710062 China School of Chemistry and Materials Science Shaanxi Normal University Xi'an 710062 China School of Chemistry and Materials Science Shaanxi Normal University Xi'an 710062 China

A novel photo-induced luminescence film has been prepared by immobilizing pyrene on quartz plate surface via a flexible long spacer, 1,3-diaminopropane and 3-glycidoxypropyl trimethoxysilane. The film shows combined monomer and excimer emission of pyrene in both wet and dry states. Steady-state and time-resolved fluorescence emission meas-urements demonstrated that the excimer emission mainly came from direct excitation of ground state dimers, and/or monomers in aggregated state. Classical Birks?scheme plays little role in the formation of the excimers. The structures of the excimers formed during the excitation are complex. Both standard excimer of sandwich-like fully overlapped structure and distorted ex-cimer of partially overlapped structure exist in the excited state of the fluorophore. The emission of the film is sensitive to the presence of dicarboxylic acids, including ethanedioic acid, malonic acid, succinic acid, etc. The emission in the monomer and excimer region increases along with increasing the concentration of the dicarboxylic acids. The time needed for the emission to reach equilibrium depends on the nature of the acids. It has been shown that the longer the chain length of the acids, the more the time needed. This observation is explained by considering the conformational reorganization of the immobilized pyrene due to insertion of the dicarboxylic acids into the space between neighboring spacers. Experimental results from similar studies using formic acid and acetic acid are in support of this explanation. Furthermore, the response of the film to dicarboxylic acids is reversible.

关键词： pyrene, fluorescence, dicarboxylic acid, sensing property.

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Two Copper-organic Frameworks Constructed from the Flexible dicarboxylic Ligands

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Chinese Journal of Structural Chemistry 2020年第2期39卷 368-374,188页

作者：崔培培刘勇翟鸿国朱建鹏闫文宁杨云敏 Shandong Provincial Key Laboratory of Functional Macromolecular Biophysics Shandong Universities Key Laboratory of Functional Biological Resources Utilization and DevelopmentSchool of Life ScienceDezhou UniversityDezhouShandong 253023China Coordination Chemistry Institute State Key Laboratory of Coordination ChemistryNanjing National Laboratory of MicrostructuresNanjing UniversityJiangsu 210023China School of Mechanical and Electronical Engineering Dezhou UniversityDezhouShandong 253023China

Two new copper-organic frameworks [Cu4(L^1)4(DMF)4·2DMF]n(DZ-1) and [Cu(L^2)(DMF)]n(DZ-2)(H2L^1 = 2,2'-(1,4-phenylenebis(methylene))bis(sulfanediyl)dinicotinic acid and H2L^2 = 2,2'-(1,2-phenylenebis(methylene))bis(sulfanediyl)dinicotinic acid) have been synthesized and characterized. DZ-1 with a zero-dimensional structure crystallizes in monoclinic crystal system, space group P21/n with a = 17.1697(11), b = 17.1241(11), c = 18.8638(14) ?, V = 5193.2(6) ?~3, Z = 2, Dc = 1.493 g·cm^(-3), μ = 1.046 mm^(-1), F(000) = 2408. All L^1 ligands adopted syn-conformation. DZ-2 is a two-dimensional structure crystallized in monoclinic crystal system, space group P21/n with a = 11.855(5), b = 18.601(8), c = 12.319(5) ?, V = 2400.4(18) ?~3, Z = 4, Dc = 1.514 g·cm^(-3), μ = 1.124 mm^(-1), F(000) = 1124. The selective sorption of CO2 over N2 for DZ-1 was found.

关键词： copper-organic framework flexible dicarboxylic ligand conformation

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The synthesis of dialdehydes from dicarboxylic acids via imidazolines

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Chinese Science Bulletin 1997年第2期42卷 130-132页

作者： Shi, Z Gu, H Xu, LL Department of Chemistry Northwest University Xi’an China

DIALDEHYDES are important chemical industrial materials, which are widely used in textile,medicine, dye, binder, coating and so on. The traditional method for preparing dialdehydes is the catalytic oxidation of glycol. We have reported the reduction ring-opening reaction of inndazoline by NaBH4.In this note, the reduction of imidazoline by sodium and ethanol is studied. A new synthetic method for the preparation of dialdehydes from dicarboxylic acids

关键词： dicarboxylic acid imidazoline dialdehyde new synthetic method.

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Long-Chain dicarboxylic Acids Are in Short Supply

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China Chemical Reporter 2010年第6期21卷 25-26页

作者： Song Chao

Long-chain dicarboxylic acids refer to aliphaticdicarboxylic acids with carbon chainscontaining more than 10 carbon *** mainly used for the synthesis of perfumes,engineering plastics, nylon fibers, hot meltadhesives, lubricants, plasticizers and *** in ChinaThe chemical synthesis of long-chain dicarboxylicacids has several decades of *** due to the limitations of the

关键词： nylon plastics dicarboxylic Shandong fermentation

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Engineering Chitosan Using <i>α</i>, <i>ω</i>-dicarboxylic Acids—An Approach to Improve the Mechanical Strength and Thermal Stability

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Journal of Biomaterials and Nanobiotechnology 2013年第2期4卷 151-164页

作者： G. Sailakshmi Tapas Mitra Suvro Chatterjee A. Gnanamani AU-KBC Research Centre MIT Anna University Chennai India. Microbiology Division CSIR-Central Leather Research Institute Chennai India

The current scenario in tissue engineering research demands materials of requisite properties, viz., high porosity, mechanical stability, thermal stability, biocompatibility and biodegradability for clinical applications. However, bringing these properties in single biomaterial is a challenging task, which needs intensive research on suitable cross-linking agents. In the present study, 3D scaffold was prepared with above said properties using chitosan and oxalic (O), malonic (M), succinic (S), glutaric (G), adipic (A), pimelic (P), suberic (SU), azelaic (AZ) and sebacic (SE) acid (OMS- GAP-SAS) individually as a non covalent cross-linkers as well as the solvent for chitosan. Assessment on degree of cross-linking, mechanical strength, FT-IR analysis, morphological observation, thermal stability, binding interactions (molecular docking), in vitro biocompatibility and its efficacy as a wound dressing material were performed. Results revealed the degree of cross-linking for OMSGAP-SAS engineered chitosan were in the range between ≈55% - 65% and the biomaterial demonstrated thermal stability more than 300°C and also exhibited ≥3 - 4 fold increase in mechanical strength compared to chitosan alone. The bioinformatics studies evidently proved the chemistry behind the interaction of OMSGAP-SAS with chitosan. OMSGAP-SAS played dual role to develop the chitosan biomaterial with above said properties, thus matching the requirements needed for various applications.

关键词： Biomaterial Chitosan Cytocompatibility dicarboxylic Acid Mechanical Property

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Separation Behavior of U(VI) and Th(IV) on a Mixed Ion Exchange Column Using 2,6-Pyridine dicarboxylic Acid as a Complexing Agent and Determination of Trace Level Thorium in Uranium Matrix Employing High Performance Ion Chromatography

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International Journal of Analytical Mass Spectrometry and Chromatography 2013年第1期1卷 61-71页

作者： Vaibhavi V. Raut S. P. Roy M. K. Das S. Jeyakumar K. L. Ramakumar Product Development Division Bhabha Atomic Research Centre Mumbai India Radioanalytical Chemistry Division Bhabha Atomic Research Centre Mumbai India Radiochemistry and Isotope Group Bhabha Atomic Research Centre Mumbai India

Retention behavior of U(VI) and Th(IV) as their 2, 6-pyridine dicarboxylic acid (PDCA) complexes on reversed phase and ion exchange (cation, anion and mixed ion exchange) columns was studied and based on the results, a simple ion chromatography method for the determination of trace level thorium in uranium oxide using 0.075mM 2, 6-pyridine dicarboxylic acid (PDCA) and 1M KNO3 in 1.2M HNO3 as eluent (flow rate 1 mL/min)was proposed. The advantage of the developed method is that the separation of uranium matrix is not required prior to the ion chromatographic determination of trace Th. Separation was carried out on a mixed ion exchange stationary phase and a 10?4 M arsenazo (III) solution was used as post column reagent for detecting the separated metal ions. The separation of Th from uranium using PDCA in the present investigation is attributed through cation exchange mechanism. A calibration plot was constructed by following the standard addition method over the concentration range of 0.25 to 10 ppm of Th in the presence of uranium matrix, which resulted in a linear regression coefficient of 0.9978. The precision of the method was better than 5% and the LOD for Th was found to be 0.1ppm (S/N=3). The method has been validated by comparing the results with the results obtained from ICP-MS analysis where the This separated from the uranium matrix. The proposed method is simple, rapid, accurate and cost effective compared to techniques like ICP-MS or ICP-AES and is suitable for the routine kind of analysis.

关键词： Ion Chromatography Uranium Thorium 2 6-Pyridine dicarboxylic Acid

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琥珀酸

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精细石油化工 1989年第3期6卷 62-64页

作者：蒋明

又名:丁二酸（Butanediacid）;亚乙基二羧酸（Ethylene dicarboxylic acid）实验式:C4H6O4 分子量:118.09 结构式: 物化性能:本品为无嗅。

关键词： dicarboxylic 二羧酸亚乙基 Ethylene 实验式丁二酸主要生产厂家物化性能灼烧残渣加氢反应

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