Metal polypyrazolylborates - XIV. Organomercury(II) complexes with hydridotris(3,5-diphenyl-1H-pyrazolyl)borate and hydridotris(4-bromo-1H-pyrazolyl)borate. The X-ray crystal structure of [HB(3,5-Ph(2)pz)(3)]HgC2H5

摘要

The preparation and characterisation of R-Hg+ ion (R = Me, Et, Pr, i-Pr, Ph, p-Tol, Benzyl, 5-Me-Thienyl, or Ferrocenyl) complexes with the ligands Tp(Ph2) (hydridotris(3,5-diphenyl-1H-pyrazol-1-yl)borato) or Tp(4Br) (hydridotris(4-bromo-1H-pyrazol-1-yl)borato) are here reported. Comparison from H-1, C-13, and Hg-199 NMR spectra show the ligand Tp(Ph2) to be better overall donor than the Tp(4Br) one. The X-ray crystal structure of the complex Et-Hg . Tp(Ph2), which is here reported, represents the first case in which the Hg (bonded to an organic R-group and a tripodal N-donor ligand) is tetrahedrally coordinated (with some distortions), instead of being T-shaped. The compound is orthorhombic. space group P 2(1)2(1)2(1) with a = 12.966(3) Angstrom, b = 16.940(3) Angstrom, and c = 18.412(4) Angstrom; V = 4044(1) Angstrom(3); Z = 4; R(R-w) = 0.056(0.057). (C) 1998 Elsevier Science S.A. [References: 40]