Construction, photoluminescence, and catalytic reactivity study of Cd(II) complexes containing amide ligand with hydrogen-bond capable backbone: 1-Dimensional looped chain

Three new Cd(II) complexes containing 3-bpdb ligands with amide moiety as hydrogen-bond capable backbone, formulated as [Cd(3-bpdb)X2]n (3-bpdb = N,N′-dipyridin-3-ylpyridine-2,6-dicarboxamide, X = Cl (1), Br (2), and I (3)), have been synthesized. All three compounds show 1-dimensional looped chain structures, and intra- and inter-molecular hydrogen bonding interactions provide 2-dimensional sheets. Among three pausible conformers of ligand 3-bpdb, all three halide compounds show only anti–anti conformation to provide 1-dimensional looped chains. In addition, emissions of compounds 1 and 2 were observed at 424 nm and 431 nm, respectively, suggesting that they might be a good candidate for a potential hybrid inorganic–organic photoactive material. Moreover, compounds 1–3 carried out an efficient transesterification of vinyl acetate.