Crystal and molecular structure of hydrido(tetrahydroborato)bis(tricyclohexylphosphine)nickel(II)

Abstract

The crystal structure of the title complex has been determined by single-crystal X-ray diffraction techniques. Crystals are monoclinic, space group P2₁/a, with cell dimensions a= 23.168(6), b= 12.664(4), c= 13.107(3)Å;,β= 105.75(3)°, and Z= 4. The nickel atom is co-ordinated by two tricyclohexylphosphine ligands in trans positions, a hydride hydrogen, and two bridging hydrogen atoms of the tetrahydroborate ligand to give a deformed trigonal bipyramid. The structure of the compound is less distorted than that of the cobalt analogue having the same set of ligands, and the difference between the structures is discussed in terms of the d-electron configurations of the nickel and cobalt complexes.