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Four new coordination polymer compounds have been prepared using 3-amino-1,2,4-triazole (AmTRZ) as an organic linker, namely, ZnCl(AmTRZ) (1), Zn(HCO2)(AmTRZ) (2), Zn5(OH)2(AmTRZ)6(NO3)2·6H2O (3), and Zn5(OH)(AmTRZH)(AmTRZ)6(HCO2)3·5H2O (4). They were synthesized under mild hydro- or solvothermal conditions using water or dimethylformamide as solvent. Their crystal structures were characterized by single-crystal X-ray diffraction techniques, and thermal properties of all compounds were examined by thermogravimetric analysis. Isostructural compounds 1and 2(Pbca, a9.389(1) Å, b10.115(1) Å, c11.571(2) Å, V1098.9(3) Å3, Z8 for 1and a9.198(1) Å, b10.341(1) Å, c12.577(2) Å, V1196.2(3) Å, Z8 for 2) display a two-dimensional layer structure where Zn centers are linked by AmTRZ molecules to form gridlike layers containing eight-membered rings. Structure 3(Pa, a15.0448(6) Å, V3405.3(2) Å3, Z4) is a dense three-dimensional framework, featuring seven-membered channels where water and nitrate anions are located. Structure 4(I4/m, a19.2576(9) Å, c20.286(2) Å, V7523.2(9) Å3, Z8) is built from porous Zn−AmTRZ layers containing 12- and 8-membered rings, which are connected to each other by dinuclear Zn tetrahedra building units. Water and formate anions occupy the void inside the framework. [ABSTRACT FROM AUTHOR]

Two new Zn-based coordination polymers based polymers, namely, Zn7(TRZ)8(SIP)2·7H2O (1) and Zn5Na2(DMA)4(TRZ)4(SIP)4·5H2O (2) (TRZ 1,2,4-triazole, SIP sulfoisophthalate, and DMA dimethylamine), were synthesized under mild solvothermal conditions. Their crystal structures were characterized by single-crystal X-ray diffraction, and their thermal properties were examined by thermogravimetric analysis. Structure 1crystallizes in monoclinic P21/nspace group (a14.050(3) Å, b12.517(3) Å, c15.377(3) Å, 97.95(3)°, V2678.3(9) Å3, Z2), while structure 2is described as triclinic P(a9.701(2) Å, b12.442(3) Å, c17.218(3) Å, 89.83(3)°, 75.01(3)°, 73.33(3)°, V1917.5(7) Å3, Z1). Structure 1contains 8- and 16-membered channels made of Zn polyhedra linked by TRZ, which are occupied by water molecules and SIP ligands. Structure 2consists of one-dimensional chains of Zn−TRZ moieties that are linked to each other via SIP. It is a negatively charged open framework in which Naions and protonated dimethylamine in the cavities serve as counterions. [ABSTRACT FROM AUTHOR]