Mössbauer spectroscopy of 121Sb in adduct complexes of antimony pentachloride

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Abstract
The Mössbauer spectra of Sb121 in a variety of oxygen and nitrogen adduct complexes of antimony pentachloride (SbCl5L where L = NCCH3, NCC(CH3)3, NCCl, NCCCl3, OPCl3, OP(Ph)3, DMF, DMSO, NO2CH3, ON(CH3)3, Cl−, Br−) are reported. The experimental data are analyzed using the transmission integral. This technique is shown to be essential in order to get reliable hyperfine interaction parameters. Under these conditions the quadrupole interactions deduced from the Mössbauer spectra are in perfect agreement with those measured by NQR spectroscopy. The dependence of the quadrupole interaction and isomer shift on the donor power of the adduct ligand is explained in terms of the variation of the number of electrons transferred between the antimony atom and the six surrounding ligands and is supported by the NQR data available on the chlorine ions.