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

Two five-coordinated aqua­copper(II) centres chelated to pyridine-2,6-di­carboxyl­ate terminal ligands are bridged by a 1,2-bis­(pyridin-3-yl­oxy)ethane spacer. The structure includes a well-resolved cyclic water tetra­mer, which acts as a subunit to form a larger aggregate.