Cadmium(II) coordination polymers based on 3,3'-azobis(pyridine) and some aliphatic dicarboxylates: Hydrothermal synthesis, crystal structures, thermal stabilities and photoluminescence

Three new Cd(II) coordination polymers (CPs), namely, [Cd-2(mu-phsuc)(2)(mu-abpy)(2)(H2O)(2)](n) (1), {[Cd(mu(3)-glu) (mu-abpy)]center dot 3H(2)O}(n) (2) and {[Cd(mu-dmglu)(mu-abpy)(H2O)]center dot H2O}(n) (3), were synthesized by hydrothermally from 3,3'-azobis(pyridine) (abpy) using three different aliphatic dicarboxylic acids [phenyl succinic acid (phsucH(2)), glutaric acid (gluH(2)) and 3,3'-dimethyl glutaric acid (dmgluH(2))]. The structures of 1-3 were characterized by elemental analysis, infrared spectroscopy (IR), single crystal X-ray and powder X-ray diffraction (PXRD) techniques. X-ray diffraction studies have revealed that 1-3 crystallize in the monoclinic system, P21/n space group (1) and C2/c space group (2, 3). 1 and 2 show 3D structure, whereas 3 exhibits an interesting 2-fold interpenetrating 2D structure. The thermal stabilities of the CPs were studied by thermal analysis (TG/DTA) techniques. In addition, the photoluminescence properties of the CPs have been investigated.