A new isomer of [{Zn(IX)2(NO3)2}·2.5H2O]n [IX = 1,4-bis(imidazole-1-methylene)-benzene] as a rare example of topological isomerism in coordination polymers

The title topological isomer possessing a 3D interpenetrated framework formed from alternate rectangular and puckered rhombic like repeat units was synthesised and characterised by X-ray diffraction analysis.