Low temperature emission spectra, lifetimes, and emission uantum yields have been acquired at 157 K in 4:l (v:v) complications arising from dd or higher lying MLCT states. Emission spectral profiles have been fit by using a model that includes contributions from an averaged medium frequency ring stretching mode, a low frequency mode, and the solvent. Linear correlations exist between: (1) the electron-vibrational coupling constant for the medium frequency mode and the energy gap between the excited and ground states (Eo), (2) In (knr X Is) and Eo where knr is the nonradiative decay rate constant, (3) In (knr X Is) and vibrational overlap factors for nonradiative decay, calculated by using the parameters obtained by emission spectral fitting. Compared to earlier correlations at room temperature, the quality of the energy gap law correlations is greatly improved. This illustrates the importance of making equivalent state to state comparisons when discussing the excited state properties of these complexes.ethanol-methanol for a series of polypyridyl complexes of Ru 9 . At this low temperature, excited state behavior is free of (9) Caspar, J. V.; Meyer, T. J. Inorg. Chem. 1983, 22, 2444. (IO) Kober, E. M.; Caspar, J. V.; Lumpkin, R. S.; Meyer, T. J. J:Phys. ( I I ) Lumpkin, R. S.; Kober, E. M.; Worl, L.; Murtaza, Z.; Meyer, T. J.

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