Synthesis, crystal structure and thermal properties of poly[bis[μ-3-(aminomethyl)pyridine-κ2 N:N′]bis(thiocyanato-κN)manganese(II)]

Abstract

The reaction of Mn(NCS)2 with a stoichiometric amount of 3-(aminomethyl)pyridine in ethanol led to the formation of the title compound, [Mn(NCS)2(C6H8N2)2] n , which is isotypic to its Zn, Co and Cd analogues. The manganese cation is located on a centre of inversion and is octahedrally coordinated in an all-trans configuration by two terminal N-bonded thiocyanate anions as well as four 3-(aminomethyl)pyridine co-ligands, of which two coordinate with the pyridine N atom and two with the amino N atom. The 3-(aminomethyl)pyridine co-ligands connect the MnII cations into layers extending parallel to (10\overline{1}). These layers are further connected into a three-dimensional network by relatively strong intermolecular N—H...S hydrogen bonding. Comparison of the experimental X-ray powder diffraction pattern with the calculated pattern on the basis of single-crystal data proves the formation of a pure crystalline phase. IR measurements showed the CN stretching vibration of the thiocyanate anions at 2067 cm−1, which is in agreement with the presence of terminally N-bonded anionic ligands. TG–DTA measurements revealed that the title compound decomposes at about 500 K.