Spectroscopic and Magnetic Evidence for Multiple-State Emission from Tris(2,2'-Bipyridine)Ruthenium (II) Sulfate.

摘要

Spectral changes of the charge-transfer photoluminescence of the title compound between 2 and 10 K have been interpreted in terms of a manifold of emitting states in thermal equilibrium. Analysis of the band shape changes by means of the Boltzmann law yields an energy gap of 10.2/cm in excellent agreement with the value obtained from published decay time measurements. A 75-kG magnetic field on the sample maintained at 1.65 K switches the emission back to that seen at 4.2 K. These results also corroborate the assignment of the lowest two states responsible for the luminescence to A sub 1 and E symmetry in the group D sub 3. (Author)