
%0 Journal Article
%A Canty, AJ 
%A Minchin, NJ 
%A Patrick, JM 
%A White, AH 
%T Coordination chemistry of dimethylgold(III) and methylmercury(II). Synthesis, <sup>1</sup>H N.M.R. and structural studies of Poly(pyrazol-1-yl)borate complexes
%J Australian Journal of Chemistry
%D 1983/06/01
%V 36
%N 6
%P 1107-1113
%K 
%R https://doi.org/10.1071/CH9831107
%U https://www.publish.csiro.au/paper/CH9831107 
%X Dimethylgold(III) and methylmercury(II) form complexes Me2AuL and MeHgL where L are poly-(pyrazol-1-yl)borate ligands [HB(pz)3]- and [B(pz)4]-. The structure of Me,Au{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 1H n.m.r. spectra in CD2Cl2 indicate presence of rapid equilibria between pyrazole ring environments at ambient temperature and, for the MeHgII complexes, down to -90ºC. For the Me2AuIII complexes spectra at -90ºC 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) Å, &#945; 117.98(5)º, Z 18. 
