摘要
通过计算呫吨染料与二苯基碘鎓盐反应的电子转移参数,发现荧光黄与二苯基碘鎓盐反应的热力学驱动力最大,证明了实现光敏化方式是电子转移反应.通过对引发体系吸收光谱的研究,考察了不同价键结构、溶剂效应及引发剂浓度对引发体系吸收光谱的影响,证实了与C-6位酚氧离子相结合的离子种类很大程度上决定了染料敏化体系的吸收峰强度及峰形状,溶剂极性增大,吸收光谱红移;溶剂极性减小,其吸收光谱蓝移.在非极性溶剂中,引发剂浓度越高,其解离度越大,引发剂更多地以自由离子形式存在.
Through calculating the electron transfer reaction parameter between xanthene dye and diphenyl iodonium, the dynamic power of fluorescein yellow was found to be the highest among xanthene dyes. And electron transfer was proved to be the only possible path to realize the photosensitization. By the investigation of absorption spectrum of photosensitive system, the influence of valence bond structure, solvent effect and initiator concentration on the absorption spectrum was examined. The results show that the absorption peaks were red shifted with the increase of solvent polarity, and blue shifted with decrease of solvent polarity. In the nonpolar solvent, the higher the concentration of initiator, the higher the degree of dissociation, and the more the free ion will appear.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2007年第13期1253-1257,共5页
Acta Chimica Sinica
关键词
电子转移
吸收光谱
溶剂效应
electron transfer
absorption spectrum
solvent effect
