Zero-field splittings of the ligand localized 3ππ* phosphorescence of the Ru(II) complex with the π-conjugated ligand

The phosphorescence of [Ru(bhq)(CO) 2 Cl(L)] (L=PEt 3 , p -toluidine and piperidine) in glassy rigid solution and in crystals are observed. We have further obtained zero-field splittings by the method of optical detection of magnetic resonance. The location of the spectrum, lifetime, and the zero-field splittings all indicate that the emission is from the ligand localized 3 ππ* state.