Synthesis and photophysical properties of zeolite-entrapped bisterpyridine ruthenium(II). Dramatic consequences of ligand-field-state destabilization

Journal Article · Mon May 18 04:00:00 EDT 1998 · Inorganic Chemistry

DOI:https://doi.org/10.1021/ic970950u· OSTI ID:642389

Bhuiyan, A A; Kincaid, J R ^[1]

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1. 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, Journal Name: Inorganic Chemistry Journal Issue: 10 Vol. 37; ISSN 0020-1669; ISSN INOCAJ
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTRA
EMISSION SPECTRA
EXPERIMENTAL DATA
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PYRIDINES
RAMAN SPECTRA
RUTHENIUM COMPLEXES
SYNTHESIS
ZEOLITES