FIRST-ROW TRANSITION AND GROUP 12 ELEMENT BIS (POLY[4-METHYL-1H-PYRAZOL-1-YLBORATE]) DERIVATIVES - X-RAY CRYSTAL-STRUCTURE OF ZN[HB(4-MEPZ)(3)](2)CENTER-DOT-CHCL3

A series of new metal complexes of general formula M[Tp(#)](2) (where Tp(#) = hydridotris(4-methyl-1 H-pyrazol-1-yl)borate (Tp(4Me)) or tetr akis(4-methyl-1H-pyrazol-1-yl)borate (pzTp(4Me)) and M = Mn, Fe, Co, N i, Cu, Zn, Cd) were synthesized from the appropriate metal chloride an d KTp(#) in aqueous solution. These compounds are air-stable solids, s paringly soluble in most organic solvents; they have been characterize d by elemental analysis, conductivity and molecular weight measurement s, IR, UV, visible spectra and, in the case of diamagnetic compounds, also with H-1 and C-13 NMR spectra. The X-ray crystal structure of bis [hydridotris(4-methyl-1H pyrazol-1-yl)borate]zinc(II). CHCl3 has been determined. The metal is six-coordinate in a distorted octahedral geom etry. The N-Zn-N intraligand bond angles range from 84.3(1) to 86.3(1) degrees. The Zn-N distances vary from 2.114(3) to 2.205(4) Angstrom. T he geometry around the B atoms is tetrahedral. The angles N-B-N range from 106.8(3) to 111.0(3)degrees, the B-N bond distances vary from 1.5 28(6) to 1.564(5) Angstrom. Comparison is made with some related compo unds. Copyright (C) 1996 Elsevier Science Ltd