Metal Complex Quenching

Rate Constants for the Quenching of
Excited States of Metal Complexes
in Fluid Solution

An indicator of the importance of the quenching of excited states of metal complexes is the recent domination of inorganic photochemistry by studies of ruthenium(II) tris(2,2'-bipyridine), which can photosensitize electron transfer reactions, and initiate solar photochemistry.

The rate constants for the quenching of the excited states of metal ions and complexes in homogeneous fluid solution have been critically evaluated in this compilation. The following information, among others, from the original publications, is included when available: the solution medium, temperature, experimental method, range of quencher concentration used, lifetime of the excited state in the absence of quencher, and activation parameters. Quenching mechanisms which are identified are:

Data collection is complete through the end of 1986, and covers the coordination compounds of 26 metals, including the ions and complexes of the inner- and outer-transition metals, and pophyrin complexes of non-transition metals. Rate constants for 261 excited states quenched by over 400 inorganic quenchers and 600 organic quenchers have been extracted from nearly 500 publications. A detailed discussion on the conceptual background to the kinetics of quenching is included.

Published by:

Morton Z. Hoffman, Fabrizio Bolletta, Luca Moggi, and Gordon L. Hug
J. Phys. Ref Data 18 219-543 (1986) __ Ordering info.

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This document prepared by Ian Carmichael

e-mail: madden.1@nd.edu

Work supported by:

Office of Basic Energy Sciences
United States Department of Energy

Standard Reference Data
National Institute of Standards and Technology
Last update: Mar. 15, 2005