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The vibrational structure of the electronic spectra of quinoxaline in shpolskii-type hydrocarbon matrices

1977; Elsevier BV; Volume: 15; Issue: 3 Linguagem: Inglês

10.1016/0022-2313(77)90023-0

1872-7883

Karoly Brenner, Z. Ruziewicz,

Synthesis and Biological Evaluation

Quasilinear spectrum of the S1(n, π∗, 1B1) ← S0 transition of quinoxaline in crystalline methylcyclohexane matrix and quasilinear phosphorescence spectra of quinoxaline in high- and low-temperature modifications of isooctane matrix were obtained at 77 K. The results of a full vibrational analysis of the spectra are presented and discussed. The diffuseness of the absorption spectrum in the range 3200-2900 Å is ascribed essentially to a small energy gap between the S2 and S3 states. The activity of out-of-plane vibration, 865 cm-1, in the phosphorescence and the influence of matrices on the structure of the spectra suggest the possibility of out-of-plane distortion of the quinoxaline molecule in the T1 state.