Abstract
IrCl/sub 2/ (bpy-h/sub 8/) and its perdeurated analogue have been prepared. Under thermally nonequilibrated conditions (77/sup 0/K in crystalline dimethyl formamide), both compounds have nonexponential decay curves for broad-band (450 to 750 nm) emissions. When the curves are measured for narrow-band emissions centered at 497 nm, lifetimes are 5.9 and 12.2 ..mu..s, respectively. Time resolved emission spectra of the perdeuterated species at 1 and 30 ..mu..s after excitation illustrate that the 4.8 ..mu..s green emission has been assigned to a ligand-field transition. In fluid DMF thermal equilibration is demonstrated by identical lifetimes obtained for the charge transfer and ligand field emissions over the temperature range of 231 to 354/sup 0/K. A substantial isotope effect appears to be due to contributions of radiationless decay between ligand field and ground states to the overall decay kinetics. Time integrated emission spectra of both species as a function of temperature indicate that the ratio of the charge transfer emission intensity to the ligand field emission emission is temperature dependent. 1 figure, 3 tables.
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