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Prompt fluorescence from biphenylene in liquid solution: Absence of detectable S2→S0 fluorescence and its implications, vibrational structure and polarization of S1→S0 fluorescence, and orientational relaxation of molecules in S1.

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Nickel,  B.
Department of Spectroscopy and Photochemical Kinetics, MPI for biophysical chemistry, Max Planck Society;

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Citation

Nickel, B., & Hertzberg, J. (1989). Prompt fluorescence from biphenylene in liquid solution: Absence of detectable S2→S0 fluorescence and its implications, vibrational structure and polarization of S1→S0 fluorescence, and orientational relaxation of molecules in S1. Chemical Physics, 132(1-2), 219-234. doi:10.1016/0301-0104(89)80090-4.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002C-5B7C-6
Abstract
The prompt emission from S0→S2 photoexcited biphenylene in 3-methylpentane has been investigated. No prompt S2→S0 fluorescence has been observed. The implications of this negative result are discussed. It is shown that lengthening of the radiative lifetime of S2 due to intermediate strong S2-S1 coupling is the likely cause of the absence of detectable S2-S0 fluorescence. The observable resonance Raman lines of biphenylene can be assigned to totally symmetric vibrations. The position of S1,0 is determined by a vibrational analysis of the S1→S0 fluorescence. The polarization degree P of the S1→S0 fluorescence is positive. From the dependence of P on temperature and viscosity, orientational relaxation times of biphenylene in S1 are determined with Perrin's formula.