Synthesis, crystal structures and magnetic properties of helical double-stranded three-dimensional network [Co(NO 3) 2(bpt) 2·2CH 3OH] n and two-dimensional network [Mn(NCS) 2(bpt) 3·H 2O] n (bpt= N, N′-bis(3-pyridylmethyl)thiourea)

Abstract

Compounds [Co(NO 3) 2(bpt) 2·2CH 3OH] n ( 1) and [Mn(NCS) 2(bpt) 3·H 2O] n ( 2) (bpt= N, N′-bis(3-pyridylmethyl)thiourea) have been synthesized and characterized structurally. Two bpt ligands coordinate simultaneously to two cobalt(II) centers to generate the double helical one-dimensional chain [Co(NO 3) 2(bpt) 2] n . Intermolecular hydrogen-bonding arising from the interaction of thiourea units of bpt with NO 3 − ions or solvent molecular forms a three-dimensional supramolecule in the solid structure (polymer 1). Bpt ligands (polymer 2) acting as bridges connect to two manganese(II) centers lead to the one-dimensional linear chain [Mn(NCS) 2(bpt) 3] n . The two-dimensional network was formed by O⋯HN, S⋯HO and OH⋯SCN hydrogen bonds. The determination of variable-temperature magnetic susceptibilities (5–300 K) of the two compounds shows that the magnetic behavior obeys the Curie–Weiss law.