Abstract
A series of bimetallic complexes containing an (α-diimine)(CO) 3Re 1 chromophore and a covalently attached ruthenium pentaammine moiety has been prepared and characterized. Ground state properties, including absorption spectra and redox potentials, are consistent with very weak metal-metal interaction in these systems. However, picosecond luminescence decay profiles indicate that emission from the Re → α-diimine 3MLCT excited state is strongly quenched by attachment of the Ru center for complexes in both Re I/Ru II and Re I/Ru III oxidation states. Such behaviour is consistent with extremely rapid photoinduced intramolecular electron transfer processes, and the data are interpreted in light of the ‘superexchange’ mechanism. No short-lived transients are observed for the Re I/Ru III bimetallic complexes, suggesting that electron transfer may occur from the 1MLCT state in these systems.
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