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Exchange coupling in di-μ-hydroxo-bridged chromium(III) dimers

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Summary

The magnetic properties of a series of di-μ-hydroxo-bridged chromium(III) complexes of the general formula [CrLm(H2O)n(OH)]2 q± are discussed in terms of the structural features of the molecules using extended Hückel molecular orbital formalism. The singlet-triplet splittings which arise from superexchange coupling correlate with the ratio Φ/r, where Φ is the angle at the bridging oxygen atom and r is the Cr-O(bridge) bond distance. Small deviations from the overall correlation result from other structural variations and electronic effects which are not treated. Data presented for three alkoxo-bridged chromium(III) complexes reflect enhanced exchange coupling as expected from the increased electron density in the orbitals of the bridging oxygens.

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Authors and Affiliations

  1. Department of Chemistry, University of North Carolina, 27514, Chapel Hill, North Carolina, USA

    Raymond P. Scaringe, Derek J. Hodgson & William E. Hatfield

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  1. Raymond P. Scaringe
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  2. Derek J. Hodgson
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  3. William E. Hatfield
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Scaringe, R.P., Hodgson, D.J. & Hatfield, W.E. Exchange coupling in di-μ-hydroxo-bridged chromium(III) dimers. Transition Met Chem 6, 340–344 (1981). https://doi.org/10.1007/BF00623652

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