Solvothermal Synthesis and Structural Characterization of New Zn−Triazole−Sulfoisophthalate Frameworks

Two new Zn-based coordination polymers based polymers, namely, Zn 7 (TRZ) 8 (SIP) 2 ·7H 2 O ( 1 ) and Zn 5 Na 2 (DMA) 4 (TRZ) 4 (SIP) 4 ·5H 2 O ( 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 1 crystallizes in monoclinic P 2 1 / n space group ( a = 14.050(3) Å, b = 12.517(3) Å, c = 15.377(3) Å, β = 97.95(3)°, V = 2678.3(9) Å 3, Z = 2), while structure 2 is described as triclinic P 1̄ ( a = 9.701(2) Å, b = 12.442(3) Å, c = 17.218(3) Å, α = 89.83(3)°, β = 75.01(3)°, γ = 73.33(3)°, V = 1917.5(7) Å 3, Z = 1). Structure 1 contains 8- and 16-membered channels made of Zn polyhedra linked by TRZ, which are occupied by water molecules and SIP ligands. Structure 2 consists 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 Na + ions and protonated dimethylamine in the cavities serve as counterions.