A Mononuclear Cobalt(II) Complex Containing Pyridine Betaine and Thiocyanate Ligands: Triaquabis(pyridinioacetato-O)(thiocyanato-N)cobalt(1+) Tetra(thiocyanato-N)cobaltate(2-)

Abstract

The cobalt(II) complex [Co(C₅H₅NCH₂CO₂)₂(NCS)(H₂O)₃]₂ [Co(NCS)₄] has been synthesized, and characterized by X-ray crystallography. The complex comprises distorted octahedral [CO(C₅H₅NCH₂CO₂)₂(NCS)(H₂O)₃]⁺ cations, in which the cobalt atom is surrounded by two trans monodentate pyridine betaine ligands, one N-bonded thiocyanate ligand and three aqua ligands, as well as distorted tetrahedral [CO(NCS)₄]^2- anions. Two-thirds of the aqua ligands form intra- and inter-molecular hydrogen bonds with the coordinated and uncoordinated carboxylate oxygens , linking the cations into a one-dimensional polymeric block directed along a 2₁ axis.