Bimetallic complex of the type [Cu(tren)(NCS)]4[Mn(NCS)6]: A hydrogen bonded network structure

Abstract: MnCl2 ·4H2O, Cu(NO3)2 ·3H2O, tris(2-aminoethyl)amine (tren) and NH4NCS in a 1:4:4:10 molar ratio in aqueous solution results a bimetallic compound of the type [Cu(tren)(NCS)]4[Mn(NCS)6] (1) which has been characterized by microanalytical, physicochemical, spectroscopic and magnetic results. The structure of the complex is determined by X-ray diffraction study. Some pertinent crystal data are: monoclinic, space group P21/c, a =11.0442(9)Å, b =14.4923(12)Å, c =19.2505(16)Å, β =91.95(10)°, and Z =4. The crystal structure consists of a hydrogen bonded 3D network of [Cu(tren)(NCS)]+ and [Mn(NCS)6]4− ions. Manganese(II) has an MnN6 chromophore bound by six N atoms of the terminal thiocyanates. Each copper(II) centre is five coordinated by one N atom of terminal thiocyanate and four N atoms of the tripod ligand. Four copper(II) units are hydrogen bonded to form a hydrogen bonded tetramer. Each manganese(II) in turn is further engaged in hydrogen bonding to four such tetramers leading to the 3D network. Variable-temperature magnetic study shows no significant magnetic interactions among the metal ions connected by hydrogen bonding. [Copyright &y& Elsevier]