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Bis[hydro­tris(4-chloro-3,5-dimethyl­pyrazolyl)borato]nickel(II)

✍ Scribed by Desrochers, Patrick J. ;Brown, Josh R. ;Arvin, Michael E. ;Jones, Gavin D. ;Vicic, David A.

Publisher
International Union of Crystallography
Year
2005
Tongue
English
Weight
313 KB
Volume
61
Category
Article
ISSN
1600-5368

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✦ Synopsis

The title compound, [Ni(C 15 H 19 BCl 3 N 6 ) 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) A ˚is observed, typical of octahedral NiN 6 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.

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Single-crystal X-ray study T = 100 K Mean (C-C) = 0.012 A R factor = 0.043 wR factor = 0.107 Data-to-parameter ratio = 29.3 For details of how these key indicators were automatically derived from the article, see http://journals.iucr.org/e.