Determination of the lowest excited state of metal complexes of dipyrido[3,2-a : 2 ',3 '-c]phenazine

The nature of the lowest excited state of rhenium and copper complexes of d ipyrido[3,2-a,2',3'-c]phenazine (Dppz) has been determined using Resonance Raman, Time-Resolved Resonance Raman Spectroscopy and Spectroelectrochemist ry. Comparison of spectroelectrochemical data and excited state data show t hat for the complexes studied no reduced ligand bands are observed in the e xcited slate spectra thus the lowest excited states are all Ligand Centred in nature, The use of substituents at the 11 and;or 12 position of the liga nd has no effect on the excited state ordering.