Determination of the equilibrium structure of the charge-transfer state of (p-Cyanophenyl)pentamethyldisilane by means of transient infrared spectroscopy.
An equilibrium structure of the charge-transfer (CT) state of (p-cyanophenyl)pentamethyldisilane was determined by transient infrared absorption spectroscopy of its CH stretching vibration region, and by the spectral simulation with quantum chemical calculations. It was found that a pattern of the CH stretching vibration bands of the CT state is substantially different from that of the S0 state. This band feature of the CT state was well reproduced assuming the planar sigma(Si-Si)pi* state, where the disilanyl group and the phenyl ring lie in the same plane. Considering that the disilanyl group in the S0 and the locally excited pipi* states lie in the plane perpendicular to the phenyl ring, an occurrence of a twisting-type structural change during the ICT process was experimentally identified in the present study.
Ishikawa
Haruki
H
Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578 Japan. haruki@kobe-u.ac.jp
Sugiyama
Masuyuki
M
Baba
Ippei
I
Setaka
Wataru
W
Kira
Mitsuo
M
Mikami
Naohiko
N