Mercury halide complexes of tertiary phosphines. Part XVI. Dimer-monomer trend in the 1 : 1 complexes of mercury(II) halides with bulky tris(2,6-dimethoxyphenyl)phosphine (DMPP)

Bell, N. A., Coles, S. J., Hursthouse, M. B., Light, M. E., Malik, K. A. and Mansor, R. (2000) Mercury halide complexes of tertiary phosphines. Part XVI. Dimer-monomer trend in the 1 : 1 complexes of mercury(II) halides with bulky tris(2,6-dimethoxyphenyl)phosphine (DMPP). Polyhedron, 19 (14), 1719-1726. (doi:10.1016/S0277-5387(00)00451-4).

Abstract

Reactions of HgX2 (X = Cl, Br, I) with the very bulky tertiary phosphine, tris(2,6-dimethoxyphenyl)phosphine (DMPP), in either a 1:1 or a 1:2 ratio, result in only the isolation of the 1:1 adducts. The structures adopted in the solid state are markedly influenced by the steric requirement of the phosphine. In contrast to the 1:1 triphenylphosphine adducts reported earlier, which are dimeric, the DMPP mercury(II) chloride and bromide complexes are weakly linked dimers while the iodide is the first example of a mercury iodide-phosphine complex with a monomeric distorted trigonal-planar arrangement around mercury. All three complexes contain secondary interactions with the o-methoxy groups.

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