Acta Cryst. (2005). E61, m1455-m1458 [ doi:10.1107/S160053680502012X ]
Abstract: The title compound, [Ni(C15H19BCl3N6)2] or Ni(Tp*Cl)2, adds to the list of structurally characterized bis(trispyrazolyl)borate-nickel(II) complexes. The two facially coordinating N-donor Tp*Cl ligands impose pseudo-octahedral coordination on the nickel(II) center. The asymmetric unit consists of two half molecules, primarily differing in the torsion angles of the coordinated pyrazole rings relative to the central B-Ni-B axis of the molecules; each molecule is centrosymmetric. An average overall Ni-N distance of 2.104 (15) Å is observed, typical of octahedral NiN6 coordination spheres and this class of compound. The title compound readily forms good quality crystals, while its 4-H analog, Ni(Tp*)2, does not. This characteristic is attributed to close contacts between the pyrazole 4-chloro-substituents on adjacent molecules.
Online 6 July 2005
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