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

• Published in: Journal of molecular structure Vol. 1083; pp. 374 - 380
• Main Authors: Wrzeszcz, Grzegorz, Muziol, Tadeusz M, Tereba, Natalia
• Format: Journal Article
• Language: English
• Published: 05.03.2015
• Subjects: Bridges (structures); Chains; Distortion; Links; Magnetic permeability; Molecular structure; Spectra; Synthesis; Thermal decomposition
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2014.11.022

In this paper we report the synthesis method and the structure of a one-dimensional thiocyanato bridged heterometallic compound, [Cu(en) sub(2)Zn(NCS) sub(4)] times H sub(2)O (1). Moreover, we compare the structure of (1) with the previously described structures of [Cu(en) sub(2)Zn(NCS) sub(4)] times 0.5H sub(2)O (2) and [Cu(en) sub(2)Zn(NCS) sub(4)] times CH sub(3)CN (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) Aa, alpha = beta = gamma = 90 degree , V = 1918.8(5) Aa super(3) and Z = 4. Each distorted tetrahedral zinc(II) centre (with N-bonded NCS super(-)) 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).