Synthesis and Photophysical Properties of Zeolite-Entrapped Bisterpyridine Ruthenium(II). Dramatic Consequences of Ligand-Field-State Destabilization
Physical & Earth Sciences
A bisterpyridine complex of ruthenium(II) (Ru(tpy) ) has been prepared in zeolite Y supercages and investigated by electronic absorption, electronic emission, and resonance Raman spectroscopy. In free solution this complex is practically nonluminescent, having a very short excited-state lifetime (250 ps) at room temperature. However, entrapment within the zeolite supercage results in dramatic increases in emission intensity and excited-state lifetime (140 ns) at room temperature. The observed temperature dependence of the excited-state lifetime has been modeled by a kinetic equation with two thermal terms corresponding to the so-called fourth MLCT state and ligand-field state (LF), respectively. It is shown that the increased lifetime of the entrapped complex results from zeolite-induced destabilization of the LF state, a conclusion which is in agreement with results obtained for a number of other zeolite-entrapped ruthenium(II) olypyridine complexes.
Bhuiyan, A. A. & Kincaid, J. R. (1998). Synthesis and photophysical properties of zeolite-entrapped bisterpyridine ruthenium(II). Dramatic consequences of ligand-field-state destabilization. Inorganic Chemistry, 37(10): 2525-2530. doi: 10.1021/ic970950u
At the time of publication, Anwar A. Bhuiyan was affiliated with Marquette University.