Time-resolved resonance Raman spectra of octaethylporphinato copper(II) in the lowest excited triplet state

Time-resolved resonance Raman spectra were observed with the pump/probe technique using two 7 ns pulsed lasers for octaethylporphinato Cu(II) [(OEP)Cu] and its isotopomers (OEP-meso-d(4) and OEP-N-15) in the lowest excited triplet state. Raman bands were assigned on the basis of depolarization ratios and isotope shifts. Then nu(2), nu(3) and nu(4) modes of the macrocycle in the T-1 state were shifted to lower frequencies try 7, 37 and 57 cm(-1), respectively, compared with those of the ground state, but the peripheral ethyl internal modes were shifted little. The porphyrin skeletal modes exhibited significant broadening in the T-1 state but the ethyl modes did not.