Construction of coordination polymers based on a rigid tripodal nitrogen-containing heterotopic ligand that designed by mixed-donors strategy

Five new coordination polymers (CPs), namely, [Co(DIPT)2]n (HDIPT = 5-(3,5-di(1H-imidazol-1-yl)phenyl)-2H-tetrazole, 1), [Zn(DIPT)2]n (2), {[Cu(DITP)2(H2O)2]·3H2O}n (3), and{[Cu(DITP)]·DMF}n (4 and 5) based on a rigid tripodal nitrogen-containing heterotopic ligand were obtained under hydrothermal conditions. Compounds 1–2 are isostructural and exhibit 3D frameworks with relative rare two-folded interpenetrating (3,6)-connected pyr network topologies. Compound 3 is a 2D layer with (4,4) network topology if consider Cu(II) as topological node and DIPT- ligand as linker. Compounds 4–5 are topological supramolecular isomers obtained from pre-synthesized and in situ formed HDIPT, respectively. The coordination modes of Cu(I) ion and DIPT- ligand, as well as the 1D zigzag chain building block in compounds 4 and 5 are quite similar, but they are with different 4-connected gis and sra topologies, respectively. In the frameworks, the tetrazolyl group has more contributions to the formation of well-defined building blocks, while the imidazolyl group has more contributions to the linkage of the building blocks. The combination of both tetrazolyl group and imidazolyl are suitable for constructing new interesting CPs. Furthermore, the thermal stabilities and solid-state fluorescent properties of selected compounds have been investigated.