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Scientific article
English

Synthesis and crystal structure of solvent-free dodecahydro closo-dodecaborate of nickel, NiB12H12

Published inDalton Transactions, vol. 47, no. 16, p. 5843-5849
Publication date2018
Abstract

Nickel closo-dodecaborate NiB12H12 was prepared by mechanosynthesis (ball milling) of mixtures of Na2B12H12 + NiCl2 followed by hydration and drying under dynamic vacuum. The crystal structures of hydrated and anhydrous closo-dodecaborates were characterized by temperature dependent synchrotron radiation X-ray powder diffraction, ab initio calculations, thermal analysis and infrared spectroscopy. Three different water containing complexes were found: a homoleptic octahedral complex in Ni(H2O)6B12H12 crystallizing in two different deformation variants of a complex centred closo-dodecaborate cube, and a heteroleptic octahedral complex in Ni(H2O)4B12H12 containing four water molecules and two hydrogens and centring also a deformed closo-dodecaborate cube. Anhydrous nickel closo-dodecaborate was obtained by drying the hydrated sample under dynamic vacuum. It crystallizes with bcc packing of B12H12 2− anions and Ni2+ is disordered close to the triangular face of the tetrahedral interstice coordinated by a H5 square pyramid.

Keywords
  • Transition metal
  • Hydroborate
  • Powder diffraction
Research group
Citation (ISO format)
SADIKIN, Yolanda et al. Synthesis and crystal structure of solvent-free dodecahydro <i>closo</i>-dodecaborate of nickel, NiB<sub>12</sub>H<sub>12</sub>. In: Dalton Transactions, 2018, vol. 47, n° 16, p. 5843–5849. doi: 10.1039/C8DT00381E
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ISSN of the journal1477-9226
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