【作者】 刘新立；

【导师】 卢然； 赵英英；

【作者基本信息】 吉林大学 ， 有机化学， 2005， 硕士

【摘要】 本文以光致变色材料的研究为主线,制备了一系列无机,有机光致变色材料,并研究了它们的光电性质。主要内容包括: 利用溶胶一凝胶法将三种Keggin 结构的杂多酸分散到有机胺改性的二氧化硅网络中,得到了稳定性高的可逆光致变色薄膜。通过比较这三种体系的变色效率和褪色速度,得到了Keggin 系列杂多酸在此溶胶一凝胶体系中的变色行为的一般规律。采用纳米复合技术将电活性的稀土杂多金属氧酸盐K12[EuPsW3O Ollo]-54H2O 分散到聚乙烯吡咯烷酮基质中,得到了光敏性极强的快速可逆光致变色纳米复合薄膜。此复合膜在不强烈的日光照射下就可以产生非常明显的变色现象。制备了一系列取代的吲哚,利用Stobbe 缩合反应制备了具有良好抗疲劳性的吲哚取代俘精酸酐,并讨论了其机构与光致变色性能之间的关系。更多还原

【Abstract】 The design and attainment of functional molecular materials have been a main challenge for scientists in now world when science and technology competition is becoming more and more drastic. Polyoxometalates (POMs) have been found to be extremely versatile inorganic building blocks for the construction of novel functional materials owing to their defined structure and predominant physical properties, in particular electrical, magnetic, and optical properties. After POMs are introduced into nanocomposite films by virtue of intermolecular weak acting force, the cooperative action from inorganic and organic components can induce and bring novel functional characteristics. We prepared a series of inorganic-organic photoelectric functional nanocomposite films based on non-covalent bonds and studied the composition, microstructure and photoelectric properties in detail. Some creative results were obtained from the experiments mentioned above. Potochromic indolylfulgides have been identified as potential candidates for a wide range of applications including optical switches, photoregulators of biological processes, and optical memory media.The main results were outlined as following: (1)A series of reversible photochromic sol-gel composite films with good mechanical and chemical stabilities through entrapping silicotungstic acid, phosphotungstic acid and phosphomolybdic acid into a kind of organoaminomodified silica network, respectively. The photochromic mechanism involving the transfer of electron and proton of the sol-gel films has a correlation with the redox potential of heteropolyanions. Owing to the order of redox potential of heteropolyanions: phosphomolybdic acid > phosphotungstic acid > silicotungstic acid, so the phosphomolybdic acid sol-gel composite film has the highest photochromic efficiency and the slowest bleaching speed and the silicotungstic acid sol-gel composite film has the lowest photochromic efficiency and the fast bleaching speed. In addition, the photochromic response speed of the phosphotungstic acid sol-gel composite film is faster than that of common amorphous WO3 films. ( 2 ) A novel reversible photochromic film containing polyoxotungstoeuropate K12[EuP5W30O110]?54H2O (EPW) entrapped in polyvinylpyrrolidone has been prepared through a nanocomposite technique. The composite film has a very strong photosensitivity and can change from colorless to blue under the irradiation of weak sunlight. The composite film shows very fast photochromic response speed. It can show blue after one second with irradiation by 500W high-pressure mercury lamp and the color becomes saturation after thirty seconds. It also shows very good reversibility in the coloration-decoloration process. The photochromism of the composite更多还原