Abstract
Quasilinear spectra of 1,3-perinaphthadiyl have been obtained in n-pentane and n-hexane by photolysis of cyclopropanoacenaphthylene. The spectra of the biradical display a large absorption-emission asymmetry, which is discussed in terms of vibronic coupling. Our analysis indicates that the two lowest excited electronic states are separated by less than 250cm −1. The results of open shell PPP and CNDO/S calculations with various CI bases are given and compared with experimental data.
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