Hydrotris(1-pyrazolyl)borates of chromium(III)

Abstract

The preparation and characterization of dichloro- (hydrotris(1-pyrazolyl)borato)pyridinechromium(III), CrCl2(HB(PYZ)3)Py, (Py = pyridine and HB(PYZ)3-1 is the hydrotris(1-pyrazolyl)borato anion) is described. The structure of the compound was determined by single crystal X-ray diffraction. Crystals were monoclinic, P21/c, a = 11.603(2), b = 9.845(1), c = 16.095(2) Å, β = 96.04(1)° with four formula units in the unit cell. Intensities were measured on a Nicolet P3 diffractometer with use of Mokα radiation. The structure was solved by standard methods and refined to R1 = 0.0601, R2 = 0.0397 based on 3142 independent reflections. Bond lengths and angles are normal. The pyridine molecule is oriented such that the plane bisects the angle between the two cis pyrazole rings. The synthesis and preparation of the related Cr(III) species CrCl2(HB(PYZ)3)pyrazole, Ph4As[CrCl3HB(PYZ)3] and [Cr(HB(PYZ)3)2]PF6 are described and the evaluation of the CrCl2(HB(PYZ)3)L (L = pyridine or pyrazole) species for genotoxicity is discussed. © 1985.