Structural Features of Hexakis-DMSO Nickel(II) Complex Cations: Pseudo-S6- and Pseudo-S4-Propeller-Like Structures

摘要

The nickel(II) complex [Ni(DMSO)₆](BPh₄)₂ (DMSO = dimethylsulfoxide) [hexakis(dimethylsulfoxide-κO)nickel(II) bis(tetraphenylborate)] was prepared, and characterized by a single-crystal X-ray method. The compound crystallizes in the triclinic space group P1 and Z = 1 with cell parameters a = 12.4224(17)Å, b = 12.5588(18)Å, c = 12.9099(18)Å, α = 61.745(2)°, β = 89.999(2)°, γ = 63.942(2)°, V = 1537.8(4)3. 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.