Synthesis and structural studies of selenocyanato-bridged polymeric and molecular complexes of cadmium(II): presence of both end-to-end and end-on coordination

• Published in: Inorganica Chimica Acta 2003-09, Vol.353, p.217-222
• Main Authors: Choudhury, Chirantan Roy, Dey, Subrata Kumar, Mondal, Nijhuma, Mitra, Samiran, Gramlich, Volker
• Format: Article
• Language: English
• Subjects: Cadmium(II); Crystal structures; Dmen; Molecular structures; Polymeric network; Selenocyanate anions
• ISSN: 0020-1693; 1873-3255
• DOI: 10.1016/S0020-1693(03)00229-9

Two new complexes, having one two-dimensional zig–zag polymeric network [Cd 2(dmen) 2(SeCN) 4] n ( 1) and one molecular packing structure [Cd(dmen) 2(SeCN) 2] ( 2) (where dmen= N, N-dimethyl ethylenediamine), have been synthesised and characterised by infrared spectra and single crystal X-ray diffraction study. The different arrangements of selenocyanate anions result in two dimensional zig–zag polymeric sheet with the formation of two different rings, one having an eight-membered nearly hexagonal ring and another having a pseudo 16-membered ring for 1 and a molecular complex 2 with four independent molecules, having a total of 16 molecules per cell. The coordination environment in both the complexes is distorted octahedral. In the selenocyanato-bridged polymeric complex the cadmium(II) ions are linked by end-to-end coordination whereas in the molecular complex the cadmium(II) ions are bridged by end-on coordination only. Two new complexes, having one two-dimensional zig–zag polymeric network [Cd 2(dmen) 2(SeCN) 4] n ( 1) and one molecular packing structure [Cd(dmen) 2(SeCN) 2] ( 2) (where dmen= N, N-dimethyl ethylenediamine), have been synthesised and characterised by infrared spectra and single crystal X-ray diffraction study. The different arrangements of selenocyanate anions result in two dimensional zig–zag polymeric sheet with the formation of two different rings, one having an eight-membered nearly hexagonal ring and another having a pseudo 16-membered ring for 1 and a molecular complex 2 with four independent molecules, having a total of 16 molecules per cell. The coordination environment in both the complexes is distorted octahedral. In the selenocyanato-bridged polymeric complex the cadmium(II) ions are linked by end-to-end coordination whereas in the molecular complex the cadmium(II) ions are bridged by end-on coordination only.