Tetrakis(isothiocyanato) manganese(II) bis[aqua(18-crown-6) potassium] (18-crown-6)(thiocyanato)potassium

A new complex compound, i.e., tetrakis(isothiocyanato) manganese(II) bis[aqua(18-crown-6) potassium] (18-crown-6)(thiocyanato) potassium, was synthesized and its crystal structure was studied by X-ray diffraction (space group P2(1)/m, a = 13.377, b = 14.690, c = 17.499 angstrom, beta = 108.96, Z = 2) and refined by the least-squares method in anisotropic approximation to R = 0.060 for 4715 independent reflections (CAD-4 automated diffractometer, lambda MoK alpha). In the crystal, infinite chains are formed through the coordination bonds between its components. The monomer fragment of a chain [Mn(NCS)(5)K-3(18-crown-6)(3)(H2O)(2)] lies in plane m; three of the five SCN- ligands and one of the two water molecules behave as bridges. The [Mn(NCS)(4)](2-) anion has the tetrahedral structure. The coordination polyhedron of each of the three K+ cations is a distorted hexagonal bipyramid with six O atom of the corresponding crown ligand in a base. Three 18-crown-6 ligands have standard crown conformation.