【摘要】 本文利用超快时间分辨瞬态光栅光谱技术研究了受体分子结构对光致分子间电子转移速率的影响,以罗丹明101和罗丹明6G在苯胺中的溶液作为研究样品.苯胺到两种染料分子之间的前向电子转移时间常数以及后续的从染料分子到苯胺的反向电子转移时间常数可以被测得.结果表明无论是前向电子转移还是反向电子转移,罗丹明6G都较罗丹明101进行得更快.通过量子化学计算以及后续分析,发现更具柔性的罗丹明6G分子和苯胺之间具有更强的分子间电子耦合从而导致更大的分子间电子转移速率.更多还原

【Abstract】 Photo-induced electron transfer versus molecular structure of acceptors is investigated using ultrafast time-resolved transient grating spectroscopy. Typical laser dyes Rhodamine 101(Rh101) and Rhodamine 6 G(Rh6 G) in electron donor solvent—aniline are adopted as the objects. The forward electron transfer time constant from aniline to the excited singlet state of two Rhodamine dyes and subsequent back electron transfer from two dyes to aniline are measured. The experimental results denote that Rh6 G presents faster electron transfer rates with aniline in both forward electron transfer and back electron transfer processes. With chemical calculation and qualitative analysis, it is found that the flexible molecular geometry of Rh6 G leads to stronger electron coupling with donor solvent and further gives rise to larger electron transfer rates.更多还原