(2,2 '-Bipyridine-kappa N-2,N') bis(4-formylbenzoato-kappa O-1) copper(II)

The title mononuclear Cu-II complex, [Cu(C8H5O3)(2)(C10H8N2)], is comprised of a Cu-II cation, two 4-formylbenzoate (L-) ligands and a 2,2'-bipyridine (bipy) ligand. The Cu-II ion and bipy ligand lie on a crystallographic twofold rotation axis; the CuII ion is coordinated by two N atoms from one bipy ligand and two O atoms from two different carboxylate groups of two L- ligands, exhibiting effectively a distorted square-planar geometry. The complex molecules are interlinked to generate two-dimensional supramolecular layers in the ab plane, formed by C-H ... O hydrogen bonds, where the O acceptor is the O atom from the carboxylate group not involved in coordination to the Cu-II ion. The two-dimensional layers are stacked in a sequence via C-H ... O hydrogen-bonding interactions where the formyl O atom acts as acceptor.