Ultrafast electronic and vibrational dynamics of a ruthenium porphyrin complex in intersystem crossing

Using sub-5fs visible laser pulses, ultrafast time-resolved absorption change was observed for RuII (TPP)(CO) (TPP=5,10, 15, 20 tetraphenylporphirine) solved in chloroform. Exponential fitting of the time traces estimated decay life times of intermediates as 230±70 fs, 1150±260 fs, 2150±360 fs, and ≫4.8 ps for , 3(d,π∗), and 3(π,π∗), respectively. Real-time 4.8 change of instantaneous molecular vibration frequency was studied by spectrogram analysis, which reflects gradual vibration mode change in the intersystem crossing from singlet state to triplet state.