3-D Hydrogen bonded networks of three organically templated cadmium sulfates. Dehydration reactions and crystallization behavior

Three cadmium sulfates templated by either ethylenediamine, piperazine, or dabco, [NH3(CH2)(2)NH3][Cd(SO4)(2)(H2O)(4)] (1), (C4H12N2)[Cd(H2O)(6)](SO4)(2) (2), and (C6H14N2)[Cd(H2O)(6)](SO4)(2) (3), have been synthesized and crystallographically characterized. The structural studies show that they crystallize in P-1, P2(1)/n, and P2(1)/c space groups, respectively, and the solids present three different structure types. Thermal decomposition of all compounds depends not only on the structure type but also on the amino group involved in the structure. Three different thermal behaviors have been distinguished in the dehydration stage, which takes place in two, three, and one steps, in 1, 2, and 3, respectively. The temperature-dependent X-ray diffraction demonstrates that the anhydrous compound obtained by dehydration of 1 is a crystalline phase that is stable in a wide range of temperatures.