X-ray Absorption Spectroscopic Study of the Structure and Bonding in M[B(3-isopropylpyrazol-1-yl)₄]₂, Where M Is Fe, Co, Ni, Cu, and Zn

Abstract

An X-ray absorption spectroscopic study of M[B(3-isopropylpyrazol-1-yl)4]2, where M is Fe, Co, Ni, Cu, and Zn, has been undertaken to compare the local structure about the iron(II) ion with that of the other divalent transition metal ions. Earlier Mössbauer spectral studies have indicated the presence of an unusual displacement of the iron ion within its coordination sphere, especially at temperatures above 160 K; a displacement which might or might not occur in the cobalt complex whose X-ray structure is normal or in the remaining complexes. An extended X-ray absorption fine structure analysis of the absorption spectra reveals very similar coordination environments and metal to nitrogen bond lengths for the various complexes. The preedge X-ray absorption does reveal differences in the complexes, differences which result from electronic transitions of the metal 1s electron into the differing crystal field split states of the divalent metal ions.

Department(s)

Chemistry

International Standard Serial Number (ISSN)

0020-1669

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1994 American Chemical Society (ACS), All rights reserved.

Publication Date

01 Dec 1994

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