Synthesis and photophysical properties of zeolite-entrapped bisterpyridine ruthenium(II). Dramatic consequences of ligand-field-state destabilization
- Marquette Univ., Milwaukee, WI (United States). Chemistry Dept.
A bisterpyridine complex of ruthenium(II) (Ru(tpy){sub 2}{sup 2+}) 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 {sup 3}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 LFe state, a conclusion which is in agreement with results obtained for a number of other zeolite-entrapped ruthenium(II)polypyridine complexes.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-86ER13619
- OSTI ID:
- 642389
- Journal Information:
- Inorganic Chemistry, Vol. 37, Issue 10; Other Information: PBD: 18 May 1998
- Country of Publication:
- United States
- Language:
- English
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