Elsevier

Chemical Physics

Volume 20, Issue 3, 15 March 1977, Pages 371-379
Chemical Physics

Mössbauer study of the 119Sn resonance in rare-gas matrix-isolated Sn(IV)-and Sn(II)halide molecules

https://doi.org/10.1016/0301-0104(77)87026-2Get rights and content

Abstract

Mössbauer absorption spectra of rare-gas matrix-isolated SnX4 and SnX2 molecules (X = F, Cl, Br, I) have been measured at matrix temperatures of a bout 5 K. The hyperfine interaction (hfi) parameters of 119Sn in argon matrix-isolated SnX4 (X = Cl, Br, 1) molecules are identical with those of the corresponding crystalline compounds. This fact reveals that the inter-molecular interactions are negligible in the crystalline compounds as far as concerning the electronic structure of Sn4+. The 119Sn hfi parameters of rare-gas matrix-isolated SnX2 molecules differ from those measured in the crystallin compounds. This arise from the totally different coordination of tin in the two situations. The analysis of the hfi parameters using a simple bonding model yields information about the ionicity of the Sn-halogen bonds and the bonding angle in these molecules. The observed isomer shifts and quadrupole interactions can only be explained in this model with a bonding angle θ = 95° ± 2° for all SnX2 molecules and a slight increase of θ from Sn12 to SnF2.

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    Supported in part by the Bundesministerium für Forschung und Technologie.

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    Present address: Lehrstuhl für Didaktik der Physik, Universität München, 8046 Garching (FRG)

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