Synthesis, structure, photophysical and electrochemical properties of Ru(TFA)(CO)(PPh)(L) (L=2-phenylpyridine, 2--tolylpyridine) and Ru(CO)(PPhMe)(L)(L') (L= TFA, H) (L'= bipyridine, L'= 4,4'-dimethylbipyridine) relationships between ancillary ligand structure and luminescent properties.

The synthesis, structure and photophysical properties of the complexes [Ru[(CO)(TFA) (PPh)(L)] [(L = ppy = 2-phenylpyridine, (); L = 2-(p-tolyl)pyridine] (), are reported. The complexes were characterized by UV-VIS, IR and NMR and by single-crystal X-ray diffraction techniques. We also report the synthesis, structure and photophysical properties of [Ru(CO)(L)(PPhMe)(L')][PF]- [L' = bipyridine, L = TFA, (); L = H, () and L = H, L' = 4,4'-dimethlyl bipyridine ()]. These compounds were characterized by UV-VIS, IR and NMR techniques and by a single crystal X-ray diffraction in the case of . The solid state structure of [Ru(MePhP)(CO)(TFA) () which is the starting material for the synthesis - is also reported to verify the relationship of the less bulky PPhMe and for comparison with the previously reported PPh analogs. The purpose of this study was to determine the impact, if any, of replacing bpy with ppy in the case of and alkylation of the benzene ring in the case of on the photophysical and electrochemical properties compared to related Ru(bpy) complexes. In contrast to the bpy analogs and showed reversible 1e oxidations and blue-shifted MLCT absorptions. In the case of - we were interested in the effect on the photophysical properties of substituting PPh with the less bulky but more electron donating PPhMe. There were only minor changes in the photophysical and electrochemical properties relative to the previously reported PPh analogs.