Syntheses, Structures, and Characterizations of Two Pairs of Cd(II)-5-Aminotetrazolate Coordination Polymers

Two pairs of Cd(II)-5-aminotetrazolate coordination complexes, {[Cd(5-HATZ)2(H2O)2(μ2-SO4)]·H2O}n (1a) and [Cd5(5-ATZ)4(μ3-OH)2(μ5-SO4)2]n (1b), [Cd(5-HATZ)2(μ2-Cl)2]n (2a), and [Cd3(5-ATZ)4(MeCN)2(μ2-Cl)2]n (2b), have been synthesized and structurally characterized. At room temperature 1D single-bridged and double-bridged chain-like compounds 1a and 2a were isolated by solution evaporation method. Under hydrothermal synthesis at 180 °C, two three-dimensional coordination polymers 1b and 2b were isolated from compounds 1a and 2a, respectively. 1b is constructed by 3D [Cd5(μ5-SO4)2(μ3-OH)2]n4+ network templated by 5-ATZ anions. 2b exhibits the 3D metal-organic framework with a (8.122)(844.122)(42.124) topology. 5-Aminotetrazolate is a terminal ligand in 1a and 2a, whereas it is three-coordinated and/or four-coordinated in 1b and 2b. Thermal studies show that high-dimensional structures have higher thermal stability than that of 1D structures.