A two-dimensional hydrogen-bonding supramolecular architecture of bis(2,2′-bi­pyridine)[( p-phenyl­enedioxy)­diacetato]­copper(II) tetrahydrate.

In the crystal structure of the title complex, [Cu(bda)(bipy)2]·4H2O [H2bda = ( p-phenyl­ene­dioxy)­di­acetic acid or benzene-1,4-dioxy­acetic acid (C10H10O6) and bipy = 2,2′-bi­pyridine (C10H8N2)], the CuII centre is pentacoordinated, with a square-pyramidal geometry comprising four N atoms from two chelating bipy ligands and one carboxyl­ate O atom of the bda ligand. The other three uncoordinated carboxyl­ate O atoms of the bda ligand act as the acceptors of four O—H⋯O hydrogen bonds from the water molecules, among which another four O—H⋯O hydrogen-bonding interactions are also observed, resulting in a two-dimensional supramolecular pattern. [ABSTRACT FROM AUTHOR]