Azo Functionalized 5-Nitro-1,3-benzenedicarboxylate Based Coordination Polymers with Different Dimensionality and Functionality

Five azo-functionalized coordination polymers (CPs), namely, [Zn(azbpy)(NO2-bdc)·H2O]n (1), [Zn(azbpy)(NO2-bdc)]n·3H2O (2), {[Cd(azbpy)(NO2-bdc)·H2O]·2H2O}n (3), {[Mn(azbpy)2(NO2-bdc)]2}n (4), and {[Co(azbpy)(NO2-bdc)(H2O)2][Co(azbpy)0.5(NO2-bdc)(H2O)3]}n (5) have been synthesized using different transition metal salts with 5-nitro-1,3-benzenedicarboxylate (NO2-bdc2–) and 4,4′-azobispyridine (azbpy) ligand using a slow diffusion technique at room temperature. The complexes 1–5 were characterized by single crystal X-ray diffraction analysis, elemental analysis, infrared spectroscopy (IR), powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). In the solid state, compound 1 shows a wavy one-dimensional (1D) ladder; constructed through the N,N′-donor azbpy and NO2-bdc2– ligands with the metal centers, whereas compound 2 exhibits a bilayer two-dimensional (2D) sheet containing a wavy 1D ladder of metal-carboxylate, and compound 3 shows a stairlike wavy 2D sheet. Compound 4 exhibits a novel 2-f...