Some spectroscopic aspects of electron transfer in ruthenium(II) polypyridyl complexes

Some spectroscopic aspects of electron transfer in ruthenium(II) polypyridyl complexes The metal-to-ligand charge transfer (MLCT) absorption and emission properties of several ruthenium(II)-bipyridine am(m)ine complexes are compared. The Gaussian deconvolution of the spectra indicates that: (a) the emission MLCT bandwidths are smaller than the absorption bandwidths for the first components of the apparent vibronic progressions; (b) the emission bands decrease in energy and width when a polypyridyl is replaced by an am(m)ine. The observations can be interpreted in terms of a two state model and the perturbation theory-based treatment of the attenuation of the effective reorganizational energy, λr =~ λr o(1- 4α2 DA), where λr o is the reorganizational energy corresponding to no mixing between the two electron transfer states and αDA = (HDA/EDA) is the mixing coefficient. Both the solvent and molecular contributions to λr are attenuated. The MLCT excited state lifetimes also decrease with am(m)ine substitution, and the non-radiative decay rate constant at 77 K is roughly proportional to the number of am(m)ine moieties coordinated to the ruthenium center. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Some spectroscopic aspects of electron transfer in ruthenium(II) polypyridyl complexes

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Publisher
Springer Journals
Copyright
Copyright © 2002 by VSP 2002
Subject
Chemistry; Inorganic Chemistry; Physical Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1163/15685670260469401
Publisher site
See Article on Publisher Site

Abstract

The metal-to-ligand charge transfer (MLCT) absorption and emission properties of several ruthenium(II)-bipyridine am(m)ine complexes are compared. The Gaussian deconvolution of the spectra indicates that: (a) the emission MLCT bandwidths are smaller than the absorption bandwidths for the first components of the apparent vibronic progressions; (b) the emission bands decrease in energy and width when a polypyridyl is replaced by an am(m)ine. The observations can be interpreted in terms of a two state model and the perturbation theory-based treatment of the attenuation of the effective reorganizational energy, λr =~ λr o(1- 4α2 DA), where λr o is the reorganizational energy corresponding to no mixing between the two electron transfer states and αDA = (HDA/EDA) is the mixing coefficient. Both the solvent and molecular contributions to λr are attenuated. The MLCT excited state lifetimes also decrease with am(m)ine substitution, and the non-radiative decay rate constant at 77 K is roughly proportional to the number of am(m)ine moieties coordinated to the ruthenium center.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Oct 13, 2004

References

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