Syntheses, crystal structures and luminescent properties of Cu(II)/Zn(II) coordination polymers based on bis(1,2,4-triazol-1-ylmethyl)benzene position isomers and 5-nitroisophthalic acid

Three new coordination polymers, namely, [Zn(o-bbtz)(nip)]n (1), [Zn(m-bbtz)(nip)]n (2), {[Cu(o-bbtz)(nip)]·H2O}n (3), have been successfully synthesized under solventthermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectra and thermogravimetric analysis. Both complexes 1 and 2 exhibit 2D layer structure with (4,4) network, which are further connected by π⋯π interactions to generate a 3D supramolecular structure. Complex 3 shows a three-dimensional (3D) supramolecular network based on the π⋯π interactions and hydrogen bonds. The luminescent properties of 1 and 2 have also been investigated.