Dipotassium di-μ-isothiocyanato-κ4N:S-bis[(N-salicylidene-dl-valinato-κ3O,N,O′)cuprate(II)]
Abstract
The title compound, K2[Cu2(NCS)2(C12H13NO3)2], consists of two K+ cations and (N-salicylidene-d-valinato)copper(II) and (N-salicylidene-l-valinato)copper(II) coordination units connected through three-atom thiocyanate (μ-NCS) bridges into a centrosymmetric dianion. The CuII atom adopts a square-pyramidal coordination, with three donor atoms of the tridentate Schiff base and one N atom of the bridging ligand (μ-NCS) in the basal plane. The axial position is occupied by the thiocyanate S atom of a symmetry-related ligand at an apical distance of 2.9332 (10) Å. Coulombic interactions between six-coordinated K+ ions and the heteroatoms of neighbouring dimeric anions leads to the formation of one-dimensional chains of molecules parallel to [010]. The superposition of the normals of the pyramidal base planes in a direction close to [001] indicates possible π–π interactions between neighbouring units.