溶液中7AI分子接合物之光物理研究

The Photophysics Study of 7AI/Complexes in Solution

張鎮平(Chen-Pin Chang) ； 林德全(Te-Chuan Lin)

《化學》 55卷4期 (1997/12) Pp. 83-94

https://doi.org/10.6623/chem.1997051

摘要

高濃度之7AI之螢光光籍之研究，顯示雙質子在激光態之7AI雙生子間快速交換，改變 (7AI/7AI)*之結構為(7AI(T)/7AH(T))* 並放射出500 nm 左右之綠色螢光。這顯現象在7AI/ROH，7AI/H20，7AI/acetic acid 與7AI/amide 與7AI/phosphoric ester 之分子接合物中也發生。其時分光譜之研究，幫助我們了解激光態時溶劑分子重排，使分子接合物成環狀結構為進行ESDPT之必要條件。而在另一方面，由ab initio計算所得之熱含量與放射光譜資料之研究，使吾人可以由激光態熱力學之觀念，討論ESDPT之生成是自發反應或是不可能。此外，在7AI/phosphoric ester 之研究，顯示ESDPT 雖快但為stepwise方式進行。在這篇報告中，我們細述研究演進之歷史與結論，並提供最近之發展。

關鍵字

螢光 ； 時分光譜 ； 雙質子轉移 ； 變異體

並列摘要

The study of fluorescence of concentrated solution of 7AI (7-azaindole ) shows the fast double proton transfer occur in the 7AI dimer excited state. The second emission band with maxinum about 500 nm, as a green fluorescence, comes from the tautomer after proton transfer. The similar phenomena was observed in 7AI/ROH, 7AI/H20, 7AI/acetic acid, 7AI/amide, and 7AI/phosphoric ester molecular complexes. The time resolved spectrascopic study shows that the solvent rearrangement is required to fit the cyclic structure which is precurser of ESDPT (Excited State Double Proton Transfer). On the other hand, the combination of heat content from ab initio calculation and the data from emission spectra can be used to explain the possibility of ESDPT from the excited state thermo-dynamic point of view. The study of emission of 7AI/various phosphoric ester shows the ESDPT is stepwised due to the detection of emission from ion pair state of 7AI/complexes. In the report, we will discuss the progress of study in 7AI/complexes seguently and their conclusions. The recently developents were also presented.

並列關鍵字

Fluorescence ； Proton Transfer ； Tautomer ； Time-Resolution