共查询到19条相似文献,搜索用时 140 毫秒
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金属酞菁配合物的合成及其三阶非线性光学性能研究 总被引:3,自引:0,他引:3
合成了酞菁铝(AlClPc)、酞菁亚铁(Ⅱ)(FePc)、酞菁钴(Ⅱ)(CoPc)、酞菁镍(Ⅱ)(NiPc)以及酞菁铜(Ⅱ)(CuPc)等金属酞菁配合物.使用四波混频技术测量了它们在硫酸溶液中的三阶非线性光学系数x(3)值,发现四种过渡金属酞菁配合物的x(3)值随着金属的原子系数的增加而上升.而酞菁铝的x(3)值则大于酞菁亚铁(Ⅱ)和酞菁钴(Ⅱ)的x(3)值、小于酞菁镍(Ⅱ)和酞菁铜(Ⅱ)的x(3)值.文中初步讨论了金属离子的d电子以及与酞菁构成的空间结构对紫外吸收和三阶非线性光学性质的影响机理. 相似文献
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拥有大环π电子高度共轭结构的酞菁(Pc)核,具备自组装的潜在特征,且在可见光区域具有强吸收。经修饰改性的酞菁衍生物被应用于液晶显示、太阳能电池、非线性光学等光电材料中,其中液晶相行为影响材料性能方面更引人关注。通过修饰酞菁核可以改变液晶相行为,最具有代表性的修饰是酞菁核中心空腔阳离子配位和外围添加取代基团。经修饰改性的酞菁衍生物柱状自组装趋势明显,盘状中间相易形成,共轭层之间电子的传输能力得到增强,具备了作为光电材料基本性质。本文综述了近十几年来酞菁衍生物盘状液晶材料的研究进展,分析总结了酞菁核的结构修饰对其液晶性能影响之间的构效关系,最后进一步对酞菁衍生物盘状液晶在高性能材料合成方面存在缺陷和研究方向进行了展望。 相似文献
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酞菁化合物的结构与卟啉类似,对光和热稳定性好,在可见光区有强的吸收,而且它还具有半导体性能和光生伏打效应。因此作为光导材料,信息记录和储存材料,以及在模拟光合作用研究光敏电子转移反应中作为光敏剂。引起人们广泛的兴趣。一般水溶性酞菁在水溶液中容易形成聚集体。聚集体与单体的性质有很大差别。因此了解酞菁 相似文献
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由于取代方式的不同,使得金属酞菁衍生物数目庞大,结构各异。晶体结构的不同,造成配合物光电性能等多种性质的改变。酞菁类光敏材料研究方法有溶剂调节法,相转移法、溶胶-凝胶法、气相沉积法和真空热蒸发等,这些技术调变了酞菁衍生物的光电导性能,在光动力疗法等领域意义重大。酞菁类气敏材料对某些气体具有选择性高、响应灵敏等特点,可用于气体传感器的制作。建议进一步探讨取代金属酞菁衍生物的光敏、气敏机理,以便在分子层次上优化设计分子的结构,改善材料性能,拓宽应用范围。 相似文献
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Bui Dinh Nhi Akhmadullin Renat Maratovich Akhmadullina Alfiya Garipovna Aghajanian Svetlana Ivanova 《Journal of Sulfur Chemistry》2014,35(1):74-85
The activity of heterogeneous catalysts of transition metal oxides and their mixtures deposited on the polymeric matrix in the oxidation of sodium sulfide was investigated. It is shown that mixtures of manganese oxide and other transition metal oxides have high catalytic activity. It was evident that the positive synergistic effect occurred in the combined action of two or more catalytically active transition metal oxides, and the maximum effect was observed in the mixture of three catalytic agents of transition metal oxides. Catalytic mechanism of transition metal oxides for sulfide oxidation was studied. The kinetics of formation of products of sodium sulfide oxidation was studied in the presence of heterogeneous catalysts based on phthalocyanine cobalt and transition metal oxides. The dependence of the rate of formation of products of sodium sulfide oxidation on alkali concentration was investigated. Some factors influencing the oxidation rate such as sulfide, oxygen and alkaline concentrations, antioxidant and oxidation products were investigated. 相似文献
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通过固相合成的方法将聚酰胺-胺树状大分子PAMAM担载于大孔硅胶上,并对其外围分别用对羟基苯甲醛、2,4-二羟基苯甲醛和邻羟基苯甲醛进行修饰,再与SnCl2.2H2O反应形成三类共计9种不同代数树状高分子锡配合物。将该类配合物用作质量分数30%双氧水氧化酮的Baeyer-Villiger(B-V)反应的催化剂,考察其催化活性,结果表明,在该类配合物作用下,2-金刚烷酮、环戊酮、环己酮、4-甲基环己酮、4-叔丁基环己酮、3-甲基-2-戊酮和4-甲基-2-戊酮都可以发生B-V氧化反应而转化为相应的酯和内酯,底物的转化率(75%~99%)和产物选择性(95%~100%)都较高。比较了不同载体(氯球、纤维素、壳聚糖、硅胶)、不同配体的金属锡配合物对B-V催氧化反应的催化效果,研究发现,载体、配体和金属担载量对配合物的催化活性均有不同程度的影响。其中,硅胶为最好的载体,而邻羟基苯甲醛为最好的配体。 相似文献
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A convenient synthetic procedure for preparing nickel carboxylated phthalocyanine is reported. Upon further hydroxylation, such metal phthalocyanine moieties are incorporated into several melamine-based polyester high-solids systems and the structure—property correlations are examined. Molecular level spectroscopic FTIR analysis and mechanical testing are correlated in an effort to establish structure—property relations in these coatings. It is found that the presence of metal phthalocyanine macrocycle as a cross-linking agent enhances such properties as adhesion, hardness, and impact resistance. © 1993 John Wiley & Sons, Inc. 相似文献
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采用浸渍法将废弃尾矿渣中的金属离子负载于g-Al2O3载体,焙烧制备催化剂,对其进行了表征,并于石英玻璃管固定床反应器中研究催化剂对甲醛的转化效率. 结果表明,450℃焙烧所制载体g-Al2O3的结晶性好,Fe2O3在载体中分散程度高,比表面积为214.87 m2/g,而添加银离子改性后催化剂性能提高,比表面积增大为237.70 m2/g. 450℃焙烧所制催化剂对甲醛的转化效率最高达67%,而掺杂银离子所制催化剂对甲醛的转化率提高10%以上;随反应温度升高,催化剂对甲醛的转化率提高,表明利用废弃铁矿石尾矿渣所制催化剂去除甲醛具有可行性. 相似文献
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本文用苯乙烯-马来酸酐共聚物(SM)的部分酯化物(SME)对酞菁蓝颜料进行表面改性处理,发现(SME)钠盐的加入对酞菁蓝颜料临界润湿表面张力、表面自由能、粒径分布和(?)电位等表面性质有明显的影响,能有效的改善酞菁蓝颜料的润湿性、流动性和在水中的分散稳定性。 相似文献
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Surface chemistry and electrocatalytic properties of self-assembled monolayers of metal tetra-carboxylic acid phthalocyanine complexes with cobalt (Co), iron (Fe) and manganese (Mn) as central metal ions have been studied. These phthalocyanine molecules are immobilized on gold electrode via the coupling reaction between the ring substituents and pre-formed mercaptoethanol self-assembled monolayer (Au-ME SAM). X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy confirmed chemisorption of mercaptoethanol via sulfur group on gold electrode and also coupling reaction between phthalocyanines and Au-ME SAM. Electrochemical parameters of the immobilized molecules show that these molecules are densely packed with a perpendicular orientation. The potential applications of the gold modified electrodes were investigated towards l-cysteine detection and the analysis at phthalocyanine SAMs. Cobalt and iron tetra-carboxylic acid phthalocyanine monolayers showed good oxidation peak for l-cysteine at potentials where metal oxidation (MIII/MII) takes place and this metal oxidation mediates the catalytic oxidation of l-cysteine. Manganese tetra-carboxylic acid phthalocyanine monolayer also exhibited a good catalytic oxidation peak towards l-cysteine at potentials where MnIV/MnIII redox peak occurs and this redox peak mediates l-cysteine oxidation. The analysis of cysteine at phthalocyanine monolayers displayed good analytical parameters with good detection limits of the orders of 10−7 mol L−1 and good linearity for a studied concentration range up to 60 μmol L−1. 相似文献
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A. Andreev L. Prahov M. Gabrovska A. Eliyas V. Ivanova 《Applied catalysis. B, Environmental》1996,8(4):365-373
The catalytic activity of a wide range of transition metal oxides in oxidation of sulphide ions by air in aqueous medium was studied. Some specific features of the reaction mechanism on some of the studied oxides were considered. The transition metal oxides are promising catalysts for practical application. Some of these oxides will allow the preparation of catalysts possessing activity comparable to that of the cobalt phthalocyanine based catalysts, popular in industrial practice. 相似文献