Crystal structure of bis(3,5-dimethylpyrazole)-N,N'-m -[1,3-bis(diphenylphosphino)propane]-P,P'-digold(I)] diperchlorate, C37H42N4P2Au2Cl2O8

The dinuclear gold(I) dicationic complex [m-dpppAu2(pzH)2]2+. 2ClO4- prepared reacting [m-dpppAu2]2+. 2ClO4- (dppp = 1,3-bis(diphenylphosphi propane) with the azotate neutral heterocycle 3,5-dimethylpyrazole (pzH), as ancillary ligand, in THF. The X-ray crystal structure is reported: monoclinic, space group C 2/c, a=22.598(3), b=11.626(1), c=18.539(2)\A, \b=116.37(1)\, V=4364(1)\A3, z=4. The structure consists in centrosymmetric dinuclear units, where the gold atoms show approximately linear coordination with P-Au-N of 177.97(2)\. The gold(I) centres assume an anti conformation with a torsion angle Au-P-P-Au of 89.2(2)\. No intra or inter-molecular gold-gold interactions occurr. The perclorate anions are bonded by hydrogen bonds to N-H of the pyrazole rings