Vibrationally Resolved Electronic Spectra of 7,8-Benzoquinoline: Franck-condon Simulation Including Herzberg-Teller and Duschinsky Effects

摘要

cqvip:In harmonic approximation,the vibrationally resolved S1?S0 electronic absorption and emission spectra of 7,8-benzoquinoline were simulated using the Franck-Condon approximation including the Herzberg-Teller and Duschinsky effects,and the results reproduced the experimental spectra very well.Our calculations show that the Herzberg-Teller effect and the Duschinsky mixing play key role in simulating correctly the weak or forbidden transition like the S1?S0 bands of 7,8-benzoquinoline,especially the former.Based on the present theoretical results,we tentatively assigned a few bands which were not unambiguously marked in the experimental spectra.Comparing the vibrationally resolved electronic spectra of 7,8-benzoquinoline with that of phenanthrene simulated in the previous study,the increased vibronic activity of 7,8-benzoquinoline is due to the symmetry break,which is caused by the introduction of N-heteroatom into the aromatic ring of phenanthrene.