过氧铌杂多钨酸盐热分解动力学参数的测定

钼和钨的杂多配合物由于其高催化活性及抗病毒性吸引着人们的关注［１］。杂多配合物的组成改变能调变其酸性、氧化性、反应性等,因此,混配型杂多配合物的研究近二十年来十分活跃。铌取代的杂多配合物在催化方面具有很独特的性质,其催化的工业应用及其机理已引起广泛的兴趣［２］。我们发现,过氧铌杂多配合物比非过氧杂多配合物具有更高的催化活性［３］。杂多酸盐的热稳定性是影响多相催化活性的重要性质,迄今有关过氧杂多配合物的热性质和热分解反应动力学参数的研究未见报道。本文用ＴＧ、ＤＴＡ、ＤＳＣ溶解度试验,变温红外和Ｘ一…     

过氧铌取代钨磷杂多配合物的稳定性

过氧铌取代钨磷杂多配合物的稳定性龚剑，魏永慧瞿伦玉（吉林医学院预防医学系吉林１３２００１）（东北师范大学化学系长春）关键词杂多配合物，过氧铌取代，Ｄａｗｓｏｎ结构，稳定性近年杂多配合物在新型催化剂的开发［１，２］，抗病毒［３］以及作为无机离子交换剂［...     

Keggin结构过氧铌钨磷杂多配合物的合成、表征及催化性能

钼钨的杂多化合物（HPC）在催化、电催化、分子材料、药物等诸多领域中已显示出独特的功能。含过氧金属离子取代的杂多阴离子在催化以过氧化氢为氧化剂的烯烃环氧化反应中具有很高的活性和选择性。近年来,含铌的杂多配合物由于良好的催化活性和抗病毒性,引起了人们的重视。本文合成了8种Keggin结构过氧铌钨磷杂多配合物,并用红外、紫外吸收光谱、极谱-循环伏安、及^183W NMR谱等测试手段对其结构和性质进行了确定和比较,考察了它们对烯烃环氧化反应的催化活性。     

铌和过氧铌取代Dawson结构钨磷杂多配合物的氧化还原性质研究

本文用电化学方法研究了铌和过氧铌一、三取代Ｄｗｓｏｎ结构杂多配合物：ａ２－ＭａＨｂＰ２Ｗ１５ＮｂＯ６２．ｘＨ２Ｏ，ａ－１，２，３－ＭａＨｂＰ２Ｗ１５Ｎｂ３Ｏ６２．ｘＨ２Ｏ，ａ２－ＭａＨｂＰ２Ｗ１７（ＮｂＯ２）Ｏ６１．ｘＨ２Ｏ，ａ－１，２，３－ＭａＨｂＰ２Ｗ１５（ＮｂＯ２）３Ｏ５９．ｘＨ２Ｏ（Ｍ＝Ｋ，ＴＭＡ，ＴＥＡ和ＴＢＡ）共十六种盐的氧化还原性质。     

新型层柱化合物合成、表征及催化活性

将含过氧铌一、三取代钨硅、钨磷过氧杂多阴离子利用离子交换法嵌入Zn2Al类水滑石中制得层柱化合物,利用XRD,IR,UV等方法对产物的结构进行了表征。结果表明在层柱化合物中过氧杂多阴离子仍然保持Keggin结构,并且过氧键没被破坏。层柱化合物在酯化反应中显示优良的催化性能。     

过氧铌杂多配合物位置异构体的合成、表征及催化性能

合成了6种钨硅杂多配合物异构体α、β_i-M₃H₂[SiW₁₁(NbO₂)O₃₉]·H₂O(M=Me₄N⁺(TMA),Bu₄N⁺(TBA),Et₄N⁺(TEA);β_i=β₁,β₂,β₃)。IR光谱、UV光谱、极谱、I^--S₂O₃^2-滴定证明合成的杂多配合物中有NbO₂基存在, ¹⁸³W NMR光谱证明其阴离子具有Keggin结构,催化实验结果表明,合成的化合物对烯烃环氧化反应具有催化活性,且过氧杂多配合物的催化活性高于非过氧杂多配合物,β异构体的催化活性高于α。     

三铌和三过氧铌钨磷杂多配合物的合成、表征及催化性能

催化活性;三铌和三过氧铌钨磷杂多配合物的合成、表征及催化性能     

过氧锆杂多化合物的合成、表征及催化活性

过氧锆钨硅杂多化合物;异构体;环氧化反应;催化活性;过氧锆杂多化合物的合成、表征及催化活性     

Dawson结构过氧钛、锆-取代钨磷杂多配合物的合成及催化活性

过氧型钨磷杂多酸盐;环氧化作用;Dawson结构过氧钛、锆-取代钨磷杂多配合物的合成及催化活性     

Dawson结构钨铌磷杂多配合物183WNMR谱的研究

Ｄａｗｓｏｎ结构钨铌磷杂多配合物~（１８３）ＷＮＭＲ谱的研究龚剑，瞿伦玉，陈亚光，李宝利（东北师范大学化学系，长春１３００２４）张建国（中国科学院长春应用化学研究所，长春１３００２２）关键词：Ｄａｗｓｏｎ结构杂多配合物，钨铌磷杂多配合物，~（１８３）Ｗ...     

Determination and study on residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil

A QuEChERS (quick, easy, cheap, effective, rugged, and safe) method for the determination of benazolin-ethyl and quizalofop-p-ethyl in rape and soil by high-performance liquid chromatography-tandem mass spectrometry has been developed in this study. The residue and dissipation of benazolin-ethyl and quizalofop-p-ethyl in rape and soil were determined with the developed method. The half-lives of benazolin-ethyl in rape straw and soil were 3.7–5.1 days and 14.3–26.3 days, respectively. The half-lives of quizalofop-p-ethyl in rape straw and soil were 5.0-6.1 days and 0.3–9.7 days, respectively. The residue of benazolin-ethyl and quizalofop-p-ethyl in rapeseed and soil were below the detection limit (i.e., 0.5?mg?kg^?1, the maximum residue level of European Union for quizalofop-p-ethyl).     

多环芳二酐型聚酯亚胺膜的透气性能

多环芳二酐型聚酯亚胺膜的透气性能李悦生，丁孟贤，徐纪平（浙江大学高分子科学与工程研究所，杭州，３１００２７）（中国科学院长春应用化学研究所）关键词聚醚酰亚胺，聚酯酰亚胺，膜，透气性通常的聚酰亚胺加工性能较差，在芳环二酐的苯环间引入醚键等柔性基团后，其...     

微量元素与疾病诊断治疗的研究现状及展望

对国内外微量元素与疾病的关系及其诊断治疗的研究现状及研究动向进行了综述，包括：微量元素与地方病、癌肿、心血管病、糖尿病、眼病、神经系统病等。参考文献72篇。     

Conformations and steric and stacking interactions of trisubstituted ureas and thioureas with alkyl and phenyl groups

The monomeric ν(N—H) vibrations of various trisubstituted ureas of the R₂UPh type and -thioureas of the R₂TUPh type have been studied. The trans—out isomerism in the former and the trans—out—cis isomerism in the latter are discussed from the point of view of steric effect. The monomeric ν(N—H) vibrations of RPhUPh and RPhTUPh are also examined. The single band appearing in the spectrum of both ureas is characteristic of the cis form; this suggests the existence of phenyl—phenyl interaction (the stacking interaction proposed by Galabov et al. [10]). Behavior of ν(N—H) vibrations at several concentrations is shown to be clearly different in the three forms (trans, out and cis). The presence of the cis form is confirmed by solvent effect experiments.     

Ti-V基储氢合金及其氢化物的物相结构与组分优化设计

Ti-V基储氢合金在室温、常压下即可表现出良好的储氢特性,且质量储氢容量明显高于传统AB₅型储氢合金,从而在氢气的精制和回收、运输和储存及热泵等方面有较早的应用。 此外,在混合气体分离、核反应堆中处理氢的同位素、镍氢电池及燃料电池负极材料等方面也得到了广泛的研究与关注。 基于目前Ti-V基储氢合金的研究现状,概述了该类合金的优势、限制性因素(包括成因)及改性手段。 此外,为了进一步理解Ti-V基合金储氢机理、构建合金组分与储氢特性之间的对应关系,本工作重点围绕Ti-V基储氢合金及其氢化物的结构、组分优化设计展开综述,并对其未来研究方向做出展望。     

钒与糖代谢及糖尿病

微量元素钒作为生物体内必需元素，经证实有很重要的生理学功能，与机体糖代谢有十分密切的关系，且能降低糖尿病动物模型的高血糖，极有可能被开发为治疗糖尿病的药物。     

Ferrocene and ferrocenium modified clays and their styrene and EVA composites

In this work, ferrocene- and ferrocenium-containing salts were employed to modify montmorillonite. X-ray measurements show an increase in the interlayer spacing upon clay modification, which means that the larger and more organophilic cations were inserted into the gallery space of montmorillonite. Attempts to prepare nanocomposites of polystyrene and ethylene vinyl acetate copolymers lead to immiscible systems; the morphology of these systems was elucidated with TEM, XRD and cone calorimetry. The thermal stability of the composites is greater than that of the virgin polymer.     

Synthesis and Optical and Redox Properties of Symmetric and Asymmetric BODIPYs

Herein, we present the synthetic route and the photophysical, electrochemical as well as laser properties of novel red‐emitting boron‐dipyrromethenes (BODIPYs) bearing arylethyne moieties. Such functionality is added along the main axis of the chromophore leading to single‐ and double‐substituted derivatives. The relationship between the dye structure and the lasing properties is studied in detail with the help of the photophysical and electrochemical properties as well as quantum mechanical simulations. The asymmetric substitution of the parent dye induces inhomogeneities in the charge distribution, which leads to an overall loss of the fluorescence capacity, mainly in polar media. Such non‐radiative deactivation processes can be softened by decreasing the electron‐donor ability of the substituent or even avoided by symmetrical substitution. Thus, grafting of the arylethyne moieties at the longitudinal axis of the indacene core results in an effective strategy to develop red‐edge BODIPYs with highly efficient and photostable laser emission.     

含茂基苯并三氮唑基镧系有机配合物的合成及表征

三茂基镧系化合物和苯并三氮唑在四氢呋喃中反应,合成了7个未见文献报道的含茂基苯并三氮唑基镧系有机配合物,经元素分析、IR和MS测定,从有关数据推测了这类配合物的可能结构。