Elsevier

Polyhedron

Volume 13, Issue 10, May 1994, Pages 1625-1630
Polyhedron

Solvent effects on cobalt(III) and chromium(III) oxalato complexes by x-ray absorption fine structure

https://doi.org/10.1016/S0277-5387(00)83458-0Get rights and content

Abstract

Cobalt and chromium K-edge XAFS (X-ray Absorption Fine Structure) spectra of [Co(ox)3[3−, [Co(ox)2], [Co(mal)2en] and [Cr(ox)3]3− (ox = oxalate, mal = malonate, en = ethylenediamine) in solids and in various solvents were measured. XANES (X-ray Absorption Near-Edge-Structure) spectra of a trisoxolato cobalt complex, and a chromium complex, vary with the type of solvent, while such a solvent effect was not detected for [Co(ox)2en] and [Co(mal)2en]. EXAFS (Extended X-ray Absorption Fine Structure) analyses of the trisoxalato complexes in solvents indicate that metal-coordinating atom distances vary depending on the solvents used and linear reduction of the distances was observed with increasing Gutmann's acceptor number of a solvent. This trend is apparently in accord with the observed blue shifts in d-d absorption spectra of [Co(ox)3] in greater acceptor number solvents. Furthermore, it was found that othr metal-ligand atom distances than interatomic distances of metal-directly coordinating atoms also shrink with acceptor numbers of solvents.

References (14)

  • H. Sakane et al.

    Bull. Chem. Soc. Japan

    (1989)
  • T. Taura

    Bull. Chem. Soc. Japan

    (1991)
  • T. Taura

    Chem. Lett.

    (1984)
    N. Miura et al.

    Bull. Chem. Soc. Japan

    (1987)
  • T. Taura

    Bull. Chem. Soc. Japan

    (1990)
  • T. Taura

    Bull. Chem. Soc. Japan

    (1989)
  • T. Taura

    Inorg. Chem.

    (1988)
  • U. Mayer et al.

    Monatsh. Chem.

    (1975)
There are more references available in the full text version of this article.

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