The antimony centre in the structurally characterised complex [H(py)2][SbI4(dmpe)][py = pyridine, dmpe = 1,2-bis(dimethylphosphino)ethane] shows significant distortions from octahedral geometry which are discussed in terms of an arrested double SN2 transition state for the nucleophilic substitution of two iodide anions by dmpe.
W. Clegg, M. R. J. Elsegood, V. Graham, N. C. Norman and N. L. Pickett, J. Chem. Soc., Dalton Trans., 1993, 997 DOI: 10.1039/DT9930000997
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