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DOI: 10.1039/A701336A (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1997, 3501-3504

Structural characterisation of the diorganoselenium interhalogen compounds R2SeIBr (R = Ph or Me) and the ionic compound [Me3Se][IBr2]

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Stephen M. Godfrey, Charles A. McAuliffe, Robin G. Pritchard and Shamsa Sarwar

Abstract

The reaction of R2Se (R = Ph or Me) with iodine monobromide in diethyl ether solution produced the charge-transfer complexes R2SeI–Br. In the case of Ph2Se, Ph2SeIBr was produced quantitatively. However, for Me2Se, both Me2SeIBr and the ionic product [Me3Se][IBr2] were produced indicating ease of methyl migration for Me2SeIBr and that it lies close to the ionic/covalent structural borderline. The other product from this autoionisation is believed to be Me2Se2I2, although this was not extensively characterised. The compounds Ph2SeIBr and Me2SeIBr show markedly different d(I–Br) 2.640(2) and 2.797(5) Å, respectively, illustrating how the R groups on the selenium affect its donor power towards iodine monobromide. The three compounds Ph2SeIBr, Me2SeIBr and [Me3Se][IBr2] have been characterised by single-crystal X-ray diffraction.

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