Zinc bis(pyrazolyl)silane complexes

The first two members of a new family of nitrogen-donor ligands, the bis(py razolyl)silanes Me2Si(3,5-R(2)pz)(2) (R = I-I, Me), have been readily synth esized in almost quantitative yield from Me2SiCl2 and the alkali metal pyra zolates M(3,5-R(2)pz) (M = Li or Na). Both bidentate ligands, abbreviated B ps and Bps(Me2), respectively, have been used to prepare the zinc derivativ es LZnX2 (L = Bps, Bps(Me2); X = Cl, Br, I), all of which have been charact erized by a combination of analytical and spectroscopic techniques and, in the case of (Bps(Me2))ZnI2, also by single-crystal X-ray diffraction. (C) 2 000 Elsevier Science Ltd. All rights reserved.