Ethanol(nitrato)[tris-(4-cyano-3-phenyl-1 H -pyrazol-1-yl)hydroborato]nickel(II)

The synthesis and structure is reported of Tp Ni(NO )(EtOH) or [Ni(C H BN )(NO )(C H O)], the first half-sandwich complex of a cyano-scorpionate ligand. The pseudo-octa-hedral coordination sphere of the Ni ion is comprised of a tridentate tris-(4-cyano-3-phenyl-pyrazol-yl)borate ligand, a bidentate nitrate ligand and a neutral ethanol ligand. The phenyl substituents on the Tp ligand are relatively parallel to the planes of the ethanol and nitrate ligands. An inter-molecular hydrogen-bonding inter-action is evident between the ethanol OH group and the pyrazole CN substituent. The ethanol ligand was modeled with a 0.572 (13)/0.428 (13) disorder of the methyl C atom.