Poly[(μ3-5-bromonicotinato)(5-bromonicotinato)copper(II)]

The title coordination polymer, [Cu(C6H3BrNO2)(2)](n), is composed of two structurally similar two-dimensional coordination polymers (twin layers). Both of them have the same chemical composition but they display different bond lengths and angles. In each layer, two N atoms and four carboxylate O atoms from the bridging 5-bromonicotinate ligands and four carboxylate O atoms from the terminal 5-bromonicotinate ligands bind to two Cu-II atoms to form a dinuclear paddle-wheel-like pattern. Adjacent paddle wheels are further linked by bridging 5-bromonicotinate groups to generate a two-dimensional coordination polymer; neighboring twin-like layers are finally stacked through van der Waals interactions in a 'sandwich' manner, thus generating a three-dimensional supramolecular structure.