Synthesis, characterization and crystal structure of catena-bis(1,10-phenanthroline)-μ-chloranilatocadmium(II): a zig-zag polymer based on eight-coordinated square antiprismatic units

Abstract

Abstract [Cd(phen)2(CA)]n (I, where phen is 1,10-phenanthroline and CA2− is the dianion of 3,6-dichloro-2,5-dihydroxy-1,4-benzoquinone) has been synthesized and its crystal structure has been determined by single-crystal X-ray diffraction at room temperature. The crystal of I is built from infinite chains of chloranilate-bridged cadmium(II) leading to a zig-zag structure, with the phenanthroline ligands being stacked between the chains. These interactions assist the formation of a closely packed 3D structure. The coordination environment of cadmium(II) – very scarce in its chemistry – is square antiprismatic. The polymer was also characterized with spectroscopic (IR, Raman, DRS) and thermogravimetric (TG, DTA) techniques.