cafena-Poly[potassium [copper(II)-mu-isothiocyanato-mu- N-salicylidene-beta-alaninato(2-)]]

The title polymeric compound, catena-poly[dipotassium [bis[mu-N-salicylidene-beta-alaninato(2-)]- kappa4O,N,O':O'';kappa4O'':-O,N,O'-dicopper(II)]- di-mu-isothiocyanato-kappa2N:S;kappa2S:N], {K[Cu-(NCS)(C10)H9NO3)]}n, consists of [isothiocyanato(N-salicyl-idene-beta-alaninato) copper(II)]-anions connected through the two three-atom thiocyanate (mu-NCS) and the two anti,anti-mu-carboxylate bridges into infinite one-dimensional polymeric anions, with coulombically interacting K+ counter-ions with coordination number 7 constrained between the chains. The CuII atoms adopt a distorted tetragonal-bipyramidal coordination, with three donor atoms of the tridentate Schiff base and one N atom of the bridging mu-NCS ligand in the basal plane. The first axial position is occupied by a thiocyanate S atom of a symmetry-related mu-NCS ligand at an apical distance of 2.9770 (8) A, and the second position is occupied by an O atom of a bridging carboxylate group from an adjacent coordination unit at a distance of 2.639 (2) A.