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The spin 3/2 state and quantum spin mixtures in haem proteins

Published online by Cambridge University Press:  17 March 2009

M. M. Maltempo
Affiliation:
Department of Biochemistry and Biophysics, University of Pennsylvania, Philadelphia, Pennsylvania 19131, U.S.A.
T. H. Moss
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, U.S.A.

Extract

The magnetic state of iron in haem proteins has long been recognized as a convenient indicator of chemical coordination as well as more subtle biochemical properties. In the trivalent case in particular, there are three magnetically distinct configurations of the five 3d electrons, yielding spin states of S = 1/2, 3/2 and 5/2. The first and third are extremely familiar, and often lie close enough in energy so that a thermal mixture of low-spin S = 1/2 and high-spin S = 5/2 states exists in an ensemble of molecules. Selection rules for common perturbations (ΔS = ∘, ± 1 for the spin-orbit interaction and ΔS = ∘ for the electronic Zeeman interaction) ensure that quantum mixtures, in which the wave function is a true combination of S = 1/2 and S = 5/2 components, are not observed. The mid-spin, S = 3/2, state, and allowed 5/2–3/2 and 1/2–3/2 quantum mixtures including it, are much less well known. These have only rarely been invoked in recent years as an explanation for experimental haem protein magnetic data.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1976

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