1D chain Cd(II) and Co(II) coordination polymers: Synthesis, crystal structures and luminescence properties

Two novel 1D infinite chain coordination polymers, [CdL(NO3)2]n and [CoL(NO3)2]n (L = 4,4′-bis[2-(2-pyridyl)ethenyl]biphenyl) have been prepared by reacting Cd(NO3)2 and Co(NO3)2 with the novel ligand L. Complexes 1 and 2 have been characterized by elemental analysis, IR and single crystal X-ray diffraction determination. The metal ions in the polymers have six coordinate pseudo octahedral structures with two pyridyl nitrogen atoms of L and four oxygen atoms of nitrate. The ligand coordinates to metal ions forming bridges in different geometries (cis and trans coordination modes). The results of TGA determination show that the coordination polymers are quite thermally stable. The complexes exhibit a strong emission band with the maximum intensity at 524 and 545 nm in solid-state, respectively, upon excitation at 350−450 nm.