6-Br-苯并噻唑重氮氨基偶氮苯的合成及其与镉(Ⅱ)的显色反应研究

合成了新三氮烯类试剂——６－Ｂｒ－苯并噻唑重氮氨基偶氮苯。通过红外光谱和元素分析等验证了其结构,研究了试剂与镉（Ⅱ）的显色反应。结果表明,该试剂是测定微量镉（Ⅱ）的高灵敏显色剂之一,其ε值达２．２３×１０５Ｌ·ｍｏｌ－１·ｃｍ－１,并且有较好的选择性。用拟定的方法测定了废水中的微量镉,结果令人满意     

锌与7－（2－羧基－4－溴－苯偶氮）－8－羟基喹啉－5－磺酸的显色反应研究及茶叶中锌的测定

本文研究了新显色剂７－（２－羧基－４－溴－苯偶氮）－８－羟基喹啉－５－磺酸与锌的反应条件，试验结果发现在乳化剂ＯＰ存在下，酒石酸介质中新试剂与锌形成稳定配合物，其最大吸收波长为５００ｎｍ，表观摩尔吸光系数为１．１５×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１），Ｚｎ￣（２＋）浓度在０～８μｇ／ｍＬ之间符合比尔定律，方法用于茶叶中微量锌的测定结果满意。     

4,4‘—二偶氮苯重氮氨基偶氮苯分光光度法测定水和废水中的痕量汞（Ⅱ）

报道了分光光度测定汞的一种新方法。在ＰＨ９．５的ＮＨ３·ＮＨ４Ｃｌ介质和ＴｒｉｔｏｎＸ－１００存在下，４，４‘－二偶氮苯竽氮氨基偶氮苯（ＢＢＤＡＢ）与汞（Ⅱ）迅速形成橙红色配合物，并且至少稳定４８ｈ。在实验条件下，配合物的最大吸收波长为５１５ｎｍ，摩尔吸光系数ε＝１．８×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１，Ｈｇ（Ⅱ）在０￣１２ｍｇ／２５Ｌ范围内遵守比耳定律。体系具有较强的抗干扰能力， 有镉（Ⅱ）     

新显色剂5-(5-氯-2-羟基苯偶氮)若丹宁与Au(Ⅲ)显色反应的应用研究

研究了新显色剂５－（５－氯－２－羟基苯偶氮）若丹宁与Ａｕ（Ⅲ）的显色反应．在１ｍｏｌ·Ｌ－１左右的盐酸介质中，Ａｕ（Ⅲ）与试剂形成１∶１的橙红色配合物，最大吸收峰位于５４０ｎｍ，表观摩尔吸光系数为５．７５×１０４Ｌ·ｍｏｌ－１·ｃｍ－１．大量碱金属、碱土金属和有色金属离子不干扰测定，贵金属元素除钯外，也有较大的允许量，该反应选择性较好，灵敏度较高，无须加掩蔽剂，方法可用于含金废水中金的测定，结果满意     

钼(Ⅵ)-4-(5-溴-2-噻唑偶氮)邻苯二酚-二苯胍三元离子缔合物的萃取分光光度研究

在ｐＨ４．０的介质中，Ｍｏ（Ⅵ）与新试剂４－（５－溴－２－噻唑偶氮）邻苯二酚（５－Ｂｒ－ＴＡＰＣ）和二苯胍（ＤＰＧ）反应形成稳定的三元离子缔合物，其组成比Ｍｏ（Ⅵ）：５－Ｂｒ－ＴＡＰＣ∶ＤＰＧ为１∶３∶２。该三元缔合物氯仿萃取液的λｍａｘ为５３６ｎｍ，对比度为１１９ｎｍ，表观ε为６．３３×１０４Ｌ·ｍｏｌ－１·ｃｍ－１。钼（Ⅵ）含量在０～０．８０ｍｇ／Ｌ范围内遵从比耳定律，并探讨了离子缔合物的结构。将在最佳显色条件下拟定的分析方法用于合金钢中小量或痕量钼的测定，取得了满意的结果。     

新显色剂1－（对－偶氮苯）－3－（2－噻唑）－三氮烯与锌显色反应的研究及应用

本文研究了新显色剂１－（对－偶氮苯）－３－（２－噻唑）－三氮烯在非离子表面活性剂ＴｒｉｔｏｎＸ－１００存在下，与锌（Ⅱ）显色反应的适宜条件。结果表明，在ｐＨ１３．０～１４．０范围内，锌（Ⅱ）与题示试剂形成１：３的稳定粉红色配合物，其最大吸收波长为５４５ｎｍ，试剂的最大吸收波长为４６３ｎｍ。配合物表现摩尔吸光系数在５４５ｎｍ处为９．６×１０￣４Ｌ·ｍｏｌ￣（－１）＊ｃｍ￣（－１）；０～２４μｇ／２５ｍＬＺｎ符合比耳定律。该试剂对锌的选择性良好。方法用于铝合金中锌的直接测定，结果令人满意。     

新显色剂2－氯－5－羧基苯基重氮氨基偶氮苯的合成及与镉显色反应的研究

本文报道了新显色剂２－氯－５－羧基苯基重氮氨基偶氮苯（ＣＣＤＡＡ）的合成。研究了在ｐＨ９．８硼砂－氢氧化钠介质中、在ＴｒｉｔｏｎＸ－１００存在下镉（Ⅱ）与ＣＣＤＡＡ形成稳定的红色配合物，λ＿（ｍａｘ）＝４８５ｎｍ，ε＿（１８５）＝１．２４×１０￣５Ｌ．ｍｏｌ￣（－１）、ｃｍ￣（－１），镉量在０～１０μｇ／２５ｍＬ范围内遵守比尔定律。本法灵敏度高，选择性好，已用于测定工业废水中微量镐（Ⅱ），结果满意。     

2-（4-氯-2-膦酸苯偶氮)-7-(2，6-二溴-4-磺胺基苯偶氮)-1,8-二羟基-3,6-萘二磺酸与铋的显色反应及其应用

研究了２－（４－氯－２－膦酸苯偶氨）－７－（２,６－二溴－４－磺胺基苯偶氮）－１,８－二羟基－３,６－萘二碳酸（偶氮氯膦－ＤＢＳＡ,ＤＢＳＡＰＡ）与铋的显色反应。在高氯酸－水溶液中,显色剂与铋（Ⅲ）形成稳定的蓝紫色络合物,最大吸收波长在 ６３７ｎｍ处,在 ０～ ０．６０ｍｇ／Ｌ范围内符合比耳定律。该反应灵敏度高,ε６３７＝１．４８ ×１０５ Ｌ·ｍｏｌ－１·ｃｍ－１。应用该法测定了钨矿和铅黄铜矿中微量,结果满意。     

4,4′-二偶氮苯重氮氨基苯与钴的显色反应研究及应用

研究了新试剂４,４′－二偶氮苯重氮氨基苯（ＢＡＢＤＢ）与钴的显色反应。在ＴｒｉｔｏｎＸ－１００ 的存在下,ｐＨ ９．５～１０．３ 的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ 缓冲溶液中,钴与试剂形成１∶２ 型鲜红色配合物,最大的吸收波长为５３５ ｎｍ ,表观摩尔吸光系数为１．４５×１０５ Ｌ· ｍ ｏｌ－ １·ｃｍ － １。用拟定的方法测定了维生素Ｂ１２中钴含量,结果令人满意。     

2-(4-氯-2-膦酸基苯偶氮)-7-(2,6-二溴-4-氯苯偶氮)-1,8-二羟基3,6-萘二磺酸与铋的显色反应及应用

１ 引 言 ＤＢＣ－偶氮氯膦全称为：２－（４－氯－２－膦酸基苯偶氮）－７－（２，６－二溴－４－氯苯偶氮）－１，８－二羟基３，６－萘Ｈ磺酸，简写为ＤＢＣ－ＣＰＡ。它已用于稀土、钡、锶、钙和钐的测定。作者在研究了该试剂与铁显色反应的基础上，又研究了与铋的显色反应，发现在１．２ｍｏＬ／Ｌ　ＨＣｌＯ４的介质中，于少量乙醇存在下，试剂与铋生成２：１的络合物，络合物稳定性好，灵敏度高，其表观摩尔吸光系数 １．０８× １０５ Ｌ·ｍｏｌ－１·ｃｍ－１，常见离子：银、镁、镉、钴、镍、铜、锰、铝、锌、铁、铬、硅等允许共…     

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。     

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).     

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.     

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。     

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.     

Synthesis of Tyrosol and Hydroxytyrosol Glycofuranosides and Their Biochemical and Biological Activities in Cell-Free and Cellular Assays

Tyrosol (T) and hydroxytyrosol (HOT) and their glycosides are promising candidates for applications in functional food products or in complementary therapy. A series of phenylethanoid glycofuranosides (PEGFs) were synthesized to compare some of their biochemical and biological activities with T and HOT. The optimization of glycosylation promoted by environmentally benign basic zinc carbonate was performed to prepare HOT α-L-arabino-, β-D-apio-, and β-D-ribofuranosides. T and HOT β-D-fructofuranosides, prepared by enzymatic transfructosylation of T and HOT, were also included in the comparative study. The antioxidant capacity and DNA-protective potential of T, HOT, and PEGFs on plasmid DNA were determined using cell-free assays. The DNA-damaging potential of the studied compounds for human hepatoma HepG2 cells and their DNA-protective potential on HepG2 cells against hydrogen peroxide were evaluated using the comet assay. Experiments revealed a spectrum of different activities of the studied compounds. HOT and HOT β-D-fructofuranoside appear to be the best-performing scavengers and protectants of plasmid DNA and HepG2 cells. T and T β-D-fructofuranoside display almost zero or low scavenging/antioxidant activity and protective effects on plasmid DNA or HepG2 cells. The results imply that especially HOT β-D-fructofuranoside and β-D-apiofuranoside could be considered as prospective molecules for the subsequent design of supplements with potential in food and health protection.     

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.