旋涂-逐层自组装制备光响应性聚丙烯酸酯类偶氮聚电解质多层膜

偶氮聚电解质的静电逐层自组装是实现偶氮聚合物功能性的重要手段,是制备诸如光存储材料、光开关材料和非线性光学材料等的新途径.因此,光响应性偶氮聚电解质的静电逐层自组装已引起了人们的广泛关注.静电逐层自组装通常在水溶液中进行,即通过基材在在水溶液中的交替浸渍和逐层     

染料的生物污泥吸附

综述了活性污泥、厌氧污泥、干污泥、不同方法失活的污泥等对42种染料的吸附结果,并对生物污泥吸附过程中适用的吸附等温线进行了总结,同时讨论了pH、温度、染料初始浓度、干污泥的粒径、离子强度、生物污泥有无活性等因素对生物污泥吸附的影响,并对今后的研究重点进行了展望。     

Selective reduction of alkenes, α,β-unsaturated carbonyl compounds, nitroarenes, nitroso compounds, N,N-hydrogenolysis of azo and hydrazo functions as well as simultaneous hydrodehalogenation and reduction of substituted aryl halides over PdMCM-41 catalyst under transfer hydrogen conditions

Chemoselective reductions of alkenes, α,β-unsaturated carbonyl compounds, nitro and nitroso compounds, N,N-hydrogenolysis of azo and hydrazo functions as well as simultaneous reduction and hydrodehalogenation of substituted aryl halides, including bulkier substrates, were achieved by catalytic transfer hydrogenation (CTH) using mesoporous PdMCM-41 catalyst. The yields were practically unaffected upon recycling of the catalyst. Further, the CTH process is accomplished without affecting the reduction of any other reducible functional group.     

Cyclobutenediylium Dyes

In agreement with the aromaticity and electrophilic behavior of squaric acid, a cyclobutenediyliumtetroxide ion is formulated as a limiting form of the squarate dianion. These views are confirmed by the structure of a series of new compounds that are readily obtainable from squaric acid or its derivatives, and most of which are deeply colored. The compounds contain the cyclobutenediyliumdioxide grouping as the chromophore, and form a new class of dyes, for which the name cyclobutenediylium dyes is proposed.     

新型支化侧链偶氮聚电解质的合成与性能研究

通过后重氮偶合的方法合成了一种含支化侧链偶氮苯生色团的聚电解质 (PBANT AC) .用IR、NMR、DSC、UV和元素分析等手段对聚合物的结构和性能进行了表征 .研究发现 ,在不同比例的水和四氢呋喃混合溶剂中PBANT AC的紫外 可见光光谱有很大的差别 .这种差别反映了PBANT AC分子中的偶氮苯生色团的不同聚集状态 .通过静电吸附逐层自组装的方法将PBANT AC分子组装成多层膜 .在 488nm的偏振Ar+ 激光的照射下 ,聚合物薄膜中的偶氮苯生色团可发生光致取向 ,取向有序度约 0 0 5 .偶氮苯生色团的顺反异构化反应使H 聚集体在光照后发生解聚集     

支化侧链偶氮聚电解质的光致二向色性和表面起伏光栅

通过后重氮偶合的方法合成了两种含支化侧链偶氮苯生色团的聚电解质PBANT AC和PBACT AC .用红外光谱、氢核磁共振谱、紫外 可见光光谱、热分析和元素分析等手段对聚合物的结构和性能进行了表征 .在 4 88nm的偏振Ar+ 激光的照射下 ,聚合物薄膜中的偶氮苯生色团可发生光致取向 ,取向有序度分别为 0 12和 0 0 9.在干涉偏振激光束的照射下 ,两种聚合物旋涂膜表面均形成了规则的正弦表面起伏光栅 ,其起伏深度分别为 4 0nm和 80nm左右 .用氦氖激光实时检测 ,测定了两种旋涂膜表面起伏光栅的一级衍射效率随光照时间的变化关系 .     

重氮偶合方法合成主链型光响应偶氮聚合物

提出了一种利用重氮偶合方法合成主链偶氮聚合物的新方法,合成了一种主链含有假芪型偶氮生色团的聚合物.对合成聚合物的结构、热性能以及光响应性能进行了详细表征.在线偏振激光的作用下,聚合物膜中的偶氮苯生色团发生光致取向,用偏振紫外-可见光光谱测量了此聚合物膜的二向色性,得到聚合物膜的取向有序度为0.03.用波长为488 nm,能量密度为150 mW/cm2的相干Ar+激光对聚合物膜照射1000 s,得到形貌规整的正弦波形表面起伏光栅,光栅的周期为900 nm,起伏深度为89 nm.     

Quantum chemical studies on some potentially tautomeric oxazolidin-4-one derivatives and their thio and azo anologs

The basicities and nucleophilicities along with prototautomerism of biologically active oxazolidin-4-one and its thio and azo analogs were investigated by semi-empirical methods. The oxo and thion protonation were found to be easier than that of azo protonation for 4-oxo and 4-thion derivatives whereas amino protonation was found to be easier than imino and azo protonation in 4-imino derivative. The preferred tautomeric form for 4-oxo and 4-thion derivatives were found to be the keto and thion forms, respectively, whereas the amino form was found to be preferred in 4-imino derivatives. An acceptable correlation between gas phase proton affinities and aqueous phase acidity constants as well as the correlation between nucleophilicity and acidity constants was observed.     

The effect of solvent on the reactions of allyltin (IV) compounds with singlet oxygen, 4-phenyl-1,2,4-triazoline-3,5-dione and diethyl azodicarboxylate

The effect of the influence on the increase of polarity of the solvent on the selectivity and rate of metalloene reactions of different allyltin compounds with singlet oxygen, 4-phenyl-1,2,4-triazoline-3,5-dione (TD) and diethyl azodicarboxylate has been studied.     

Solvent and pH Effects on the Electronic Spectra of Some Azo Benzimidazoles

The spectral behaviour of some new azobenzimidazoles in pure and mixed organic solvents and buffer solutions of varying pH have been studied. The observed bands are assigned to the possible electronic transition. The shoulder appearing in the visible region in the spectra of P‐NO₂ derivatives is ascribed to the existence of these compounds in azo‐hydrazone tautomeric equilibrium. The possibility of the formation of an intermolecular H‐bonded solvated complex between the molecules of p‐NO₂ derivatives and the proton acceptor solvents DMSO and DMF were studied. The pK values of these compounds were determined and explained on the basis of the relative contribution of acidic and basic character of respective species.