{[Cd2(pyt)2(chdc)(H2O)](H2O)2}n: A unique bilayer coordination polymer with mixed-connected network topology (Hpyt = 5-(4-pyridyl)-1,3,4-oxadiazole-2-thiol and H2chdc = 1,4-cyclohexanedicarboxylic acid)

A unique CdII coordination polymer {[Cd2(pyt)2(chdc)(H2O)](H2O)2}n (1) has been obtained by hydrothermal reaction and characterized by IR, microanalysis, and powder X-ray diffraction (here Hpyt = 5-(4-pyridyl)-1,3,4-oxadiazole-2-thiol and H2chdc = 1,4-cyclohexanedicarboxylic acid). Single crystal X-ray diffraction reveals that complex 1 has an unusual bilayer coordination framework with mixed-connected network topology, in which two adjacent [Cd(pyt)]n layers are spaced by chdc pillars. Thermal stability of 1 has also been discussed.