RESONANCE RAMAN INVESTIGATION OF THE MLCT TRANSITION IN [PT(DPPM)(2)(PHC=C)(2)] AND THE MMLCT TRANSITION IN [PT-2(MU-DPPM)(2)(MU-PHC=C)(PHC=C)(2)](+)

We report resonance Raman spectra including absolute Raman cross secti on measurements obtained with excitation wavelengths within the MLCT a bsorption band of [Pt(dppm)(2)(PhC=C)(2)] and the MMLCT absorption ban d of [Pt-2(mu-dppm)(2)(mu-PhC=C)(PhC=C)(2)](+). We have simultaneously simulated the absolute absorption and resonance Raman intensities in order to estimate the vibrational reorganizational energies associated with the MLCT and MMLCT transitions, We observe a small amount of flu orescence background underneath the resonance Raman spectra of [Pr(dpp m)(2)(PhC=C)(2)] which we attribute to emission from the very short-li ved initially excited MLCT stale, Our quantum yield measurements of th is fluorescence yields an excited state lifetime of approximately 80-1 30 fs.