Abstract
Mössbauer spectra have been measured at 295 and 78 K for ten 57Fe-enriched iron(III) β-diketonates differing in the type of radical in the chelate ring. Since the literature data for compounds of this class are incomplete and contradictory, a repeated analysis of spectrum shape and parameters has been performed. The chemical shift and quadrupole splitting are virtually independent of the type of radical in the chelate ring whereas the line width and asymmetry exhibit a pronounced dependence on the temperature and composition of the compounds. The available concepts on the nature of quadrupole splitting and relaxation mechanisms determining the lineshape for the given compounds are refined. It is concluded that electron spin relaxation is “longitudinal” or “transverse” relative to the principal axis of the electric field gradient in different compounds.
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Varnek, V.A., Igumenov, I.K., Stabnikov, P.A. et al. Parameters and Form of the Mössbauer Spectra of Iron(III) β-Diketonates: New Data. Journal of Structural Chemistry 41, 977–988 (2000). https://doi.org/10.1023/A:1010306906401
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DOI: https://doi.org/10.1023/A:1010306906401