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

Abstract

Three new Cd(II) coordination polymers (CPs), namely, [Cd2(µ-phsuc)2(µ-abpy)2(H2O)2]n (1), {[Cd(μ3-glu)(μ-abpy)]⋅3H2O}n (2) and {[Cd(μ-dmglu)(μ-abpy)(H2O)]⋅H2O}n (3), were synthesized by hydrothermally from 3,3′-azobis(pyridine) (abpy) using three different aliphatic dicarboxylic acids [phenyl succinic acid (phsucH2), glutaric acid (gluH2) and 3,3′-dimethyl glutaric acid (dmgluH2)]. 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.