Synthesis and Single-crystal Characterization of the Square Planar Complex [Ni{(SPPh₂)₂ N−S,S‘}₂]·2THF

Reaction of Ni(CO)4 with HN(SPPh2)2 in tetrahydrofuran yielded the nickel(II) neutral complex [Ni{(SPPh2)2}2N−S,S‘]·2THF. X-ray crystallography shows a square planar NiS4 core, with a center of inversion at Ni atom. It crystallized in the space group P1̄. This compound easily isomerizes in organic solvents at room temperature or by heating a solid-state sample to form the corresponding tetrahedral isomer.