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Coordination Chemistry of dimethylgold(III) and Methylmercury(II). Synthesis, 'H N.M.R. and Structural Studies of Poly(pyrazol-1-y1)borate Complexes

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Canty, AJ, Minchin, NJ, Patrick, JM and White, AH 1983 , 'Coordination Chemistry of dimethylgold(III) and Methylmercury(II). Synthesis, 'H N.M.R. and Structural Studies of Poly(pyrazol-1-y1)borate Complexes' , Australian Journal of Chemistry, vol. 36, no. 6 , pp. 1107-1113 , doi: 10.1071/CH9831107.

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Abstract

Dimethylgold(111) and methylmercury(11) form complexes Me2AuL and MeHgL where L are poly(pyrazol-1-y1)borate ligands [HB(pz)3]- and [B(pz)4]-. The structure of Me2Au{HB(pz)3} has been determined by single-crystal X-ray diffraction at 295 K and refined by least-squares methods to R 0.056 for 2194 independent 'observed' reflections. This complex has square-planar coordination for the gold atom involving two coordinated pyrazole rings and one uncoordinated ring, in contrast to the isoelectronic cation [Me2Au{(pz)3CH)]+ which has square planar coordination with a weak axial Au . .N interaction. Variable temperature 'H n.m.r. spectra in CD2Cl2 indicate presence of rapid equilibria between pyrazole ring environments at ambient temperature and, for the MeHg(II_
complexes, down to -90°C. For the Me2Au(III) complexes spectra at -9OoC indicate presence of pyrazole ring environments in ratios 2:1 (L = [HB(pz)3]-) and 2:1:1 (L = [B(pz)4]-). Crystal data for Me2Au{HB(pz)3}: rhombohedral, space group R3c, a 17.98(1) A, alpha 117.98(5), Z 18.

Item Type: Article
Authors/Creators:Canty, AJ and Minchin, NJ and Patrick, JM and White, AH
Journal or Publication Title: Australian Journal of Chemistry
ISSN: 0004-9425
DOI / ID Number: 10.1071/CH9831107
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