Intramolecular charge transfer in pyrromethene laser dyes:: Photophysical behaviour of PM650

被引:92
作者
Arbeloa, FL [1 ]
Prieto, JB [1 ]
Martínez, VM [1 ]
López, TA [1 ]
Arbeloa, IL [1 ]
机构
[1] Univ Basque Country, Dept Quim Fis, E-48080 Bilbao, Spain
关键词
charge transfer; photophysics; pyrromethene dyes; quantum mechanics calculations; solvent effects;
D O I
10.1002/sphc.200400242
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Absorption and flourescence (steady-state and time-correlated) techniques are used to study the photophysical characteristics of the pyrromethene 650 (PM650) dye. The presence of the cyano group at the 8-position considerably shifts the absorption and flourescence bands to lower energies with respect to other related pyrromethene dyes; this is attributed to the strong electron-acceptor character of the cyano group, as is theoretically confirmed by quantum mechanical methods. The flourescence properties of PM650 are intensively solvent-dependent. The flourescence band is shifted to lower energies in polar/protic solutions, and the evolution of the corresponding wavelength with the solvent is analysed by a multicomponent linear regression. The flourescence quantum yield and the lifetime strongly decrease in polar/protic solvents, which can be ascribed to an extra nonradiative deactivation, via an intramolecular charge-transfer state (ICT state), favoured in polar media.
引用
收藏
页码:1762 / 1771
页数:10
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