76793-79-8Relevant academic research and scientific papers
Intramolecular energy transfer in a rhodium(III) metalloorganic bichromophore system. Photochemical and photoluminescence studies
Bergkamp, Michael A.,Watts, Richard J.,Ford, Peter C.
, p. 1764 - 1767 (1981)
Reported are the photochemical, photoluminescence, and spectral studies of a series of pentaammine(organonitrilo)rhodium(III) compounds, Rh(NH3)5(N≡C-R)3+ (where R is a phenyl, benzyl, or 2-phenylethyl group or a substituted derivative). The absorption spectroscopy exhibits features attributable to both ππ* and ligand field transitions. The luminescence spectra, however, exhibit only ligand field (LF) emissions regardless of whether the ππ* or LF states are initially populated. The luminescence lifetimes at 77 K are also characteristic of LF states. Irradiation of the ππ* or LF bands in aqueous solutions leads to photosubstitution of the organonitrile ligand with the quantum yields being somewhat smaller for λirr = 254 nm (ππ*) than 313 nm (LF) in most cases. The results are discussed in terms of the efficiency of interconfigurational energy transfer between ππ* and LF states.
