Construction of a 3D array of cadmium(ii) using squarate as a building block

Abstract

A unique three-dimensional coordination polymer of cadmium(II), [Cd(C4O4)(H2O)2]n1 (C4O42−⊕=⊕squarate dianion), has been synthesized and characterized by single crystal structural analysis. The molecular structure shows that each bridging squarate dianion functions as a four-fold monodentate ligand to form a cage-like channel network. The compound crystallizes in the rhombohedral system, space group R (no. 148) with a⊕=⊕b⊕=⊕11.765(6) Å and c⊕=⊕14.920(7) Å, γ⊕=⊕120°, Z⊕=⊕9, V⊕=⊕1788.5(15) Å3. Thermal investigation reveals that the dehydrated compound is remarkably stable.