Structural features of hexakis-DMSO nickel(II) complex cations: Pseudo-S6- and pseudo-S4-propeller-like structures

Abstract

The nickel(II) complex [Ni(DMSO)6](BPh4)2 (DMSO = dimethylsulfoxide) [hexakis(dimethylsulfoxide-kO)nickel(II) bis(tetraphenylborate)] was prepared, and characterized by a single-crystal X-ray method. The compound crystallizes in the triclinic space group P1̄ and Z = 1 with cell parameters a = 12.4224(17)Å, b = 12.5588(18)Å, c = 12.9099(18)Å, a = 61.745(2)°, b = 89.999(2)°, g = 63.942(2)°, V = 1537.8(4)Å3. Six DMSO molecules coordinate to a nickel(II) center to form a [Ni(DMSO)6]2+ cation. In the present crystal, the DMSO molecules are disordered, and two conformers of [Ni(DMSO)6]2+ were found to be superimposed. The NiO6S6 units in both conformers are approximated by an S6-propeller-like structure; however, in conformer A, the Ni(DMSO)4 unit in the complex cation is approximated by an S4-propeller-like structure, and tetragonal elongation is observed along the pseudo-S4 axis; while in conformer B, the whole structure is approximated as an S6-propeller-like structure, and a trigonal compression is observed along the pseudo-S6 axis. © The Japan Society for Analytical Chemistry.