A well-resolved cyclic water tetramer in a dinuclear CuIIcoordination complex based on 1,2-bis(pyridin-3-yloxy)ethane and capped by pyridine-2,6-dicarboxylic acid

Abstract

μ-1,2-Bis(pyridin-3-yloxy)ethane-κ2N:N′-bis[aqua(pyridine-2,6-dicarboxylato-κ3O2,N,O6)copper(II)] tetrahydrate, [Cu2(C7H3NO4)2(C12H12N2O2)(H2O)2]·4H2O, (I), is a C-shaped molecule based on 1,2-bis(pyridin-3-yloxy)ethane (L) and CuIIin the presence of pyridine-2,6-dicarboxylic acid (H2pydc). The two five-coordinated CuIIcentres are chelated by terminal pydc2−ligands and bridged by anLspacer. The molecules are arranged in a two-dimensional sheetvia15 O—H...O hydrogen bonds, and C—H...O interactions further bridge neighbouring sheets into a three-dimensional supermolecular architecture. The structure includes a well-resolved cyclic water tetramer, which acts as a subunit to form a larger aggregate. A thermogravimetric analysis of complex (I) was also carried out.