Symmetry assignments of the lowest CT excited states of ruthenium (II) complexes via a proposed electronic coupling model

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Abstract
Temperature dependence measurements of the decay times of the observed charge‐transfer luminescence of three ruthenium (II) complexes indicate a manifold of decaying excited levels in thermal equilibrium. Relative energies and decay constants for each level have been derived from the data for the tris(2, 2′‐bipyridine)ruthenium(II) and tris(4, 4′‐diphenyl‐2, 2′‐bipyridine)ruthenium(II) cations and for cis‐dicyanobis(2, 2′‐bipyridine) ruthenium(II). An electronic coupling model has been proposed that satisfactorily rationalizes the experimental results and allows the levels to be symmetry labeled.