Title

Synthesis and Photophysical Properties of Zeolite-Entrapped Bisterpyridine Ruthenium(II). Dramatic Consequences of Ligand-Field-State Destabilization

Document Type

Article

Publication Date

5-18-1998

Abstract

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.

DOI

10.1021/ic970950u

First Page

2525

Last Page

2530

Volume

37

Issue

10

Publication Title

Inorganic Chemistry

ISSN

00201669

Comments

At the time of publication, Anwar A. Bhuiyan was affiliated with Marquette University.

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