Ultrafast Broadband Fluorescence Up-conversion Study of the Electronic Relaxation of Metalloporphyrins

We present a systematic study of the ultrafast fluorescence with broadband detection and similar to 110 fs resolution of 5,10,15,20-tetraphenylporphin (TPP) and 2,3,7,8,12,13,17,18-oc-taethylporphin (OEP), with open 3d-shell metals. We also revisit the cases of the closed-shell ZnTPP and ZnOEP systems. We find that in all cases, the relaxation from the Soret (B)-state to the Q-states (S-1) occurs on ultrafast time scales of