Quantitative Spectroscopic Studies of the Photoexcited State Properties of Methano- and Pyrrolidino-[60]fullerene Derivatives

• Published in: The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 1997-07, Vol.101 (31), p.5626-5632
• Main Authors: Ma, Bin, Bunker, Christopher E, Guduru, Radhakishan, Zhang, Xian-Fu, Sun, Ya-Ping
• Format: Article
• Language: English
• ISSN: 1089-5639; 1520-5215
• DOI: 10.1021/jp971067k

UV/vis absorption and fluorescence spectra and fluorescence quantum yields and lifetimes of a series of methano- and pyrrolidino-[60]fullerene derivatives in different solvents are studied systematically. The absorption and fluorescence properties of the derivatives with different substituents are somewhat different from those of [60]fullerene, but very similar among themselves, indicating that the low-lying transitions and the photoexcited state processes are dictated by the electronic structures of functionalized [60]fullerene cages. The results also allow an examination of the issue concerning discrepancies between experimentally determined transition probabilities and those calculated in terms of the Strickler−Berg equation for fullerene molecules. In addition, quenchings of the excited singlet states of the [60]fullerene derivatives by electron donor N,N-diethylaniline (DEA) and the formation of emissive fullerene−DEA exciplexes in solvents of different polarities are investigated.