Synthesis, characterization and crystal structure of a 1D thiocyanato bridged [Cu(en)2Zn(NCS)4]•H2O. Comparison of the three structures with the same [Cu(en)2Zn(NCS)4] unit - different in structural terms

In this paper we report the synthesis method and the structure of a one-dimensional thiocyanato bridged heterometallic compound, [Cu(en)(2)Zn(NCS)(4)]center dot H2O (1). Moreover, we compare the structure of (1) with the previously described structures of [Cu(en)(2)Zn(NCS)(4)]center dot 0.5H(2)O (2) and [Cu(en)(2)Zn(NCS)(4)]center dot CH3CN (3) Pryma et al. (2003) [7]. The compound (1) has been characterized by thermal decomposition, IR, Vis and EPR spectra, and magnetic studies. Structure has been determined by X-ray analysis. Described coordination polymer crystallizes in the orthorhombic Cmcm space group with a = 12.414(2), b = 10.3276(14), c = 14.967(2) angstrom, alpha = beta = gamma = 90 degrees, V= 1918.8(5) angstrom(3) and Z = 4. Each distorted tetrahedral zinc(II) centre (with N-bonded NCS-) links two tetragonally distorted octahedral copper(II) centres by two end-to-end thiocyanato bridges and vice versa forming a zigzag type of CuZn chain. The structures of (1), (2) and (3) differ in crystallographic system, space group and/or CuZn chain type as well as in details. Variable temperature magnetic susceptibility measurements show very weak antiferromagnetic interactions between the paramagnetic copper(II) ions for compound (1). (C) 2014 Elsevier B.V. All rights reserved.