Syntheses, Structures And Properties Of Aromatic Carboxylate Complexes

The construction of metal-organic coordination polymers with high orderly structures from organic ligands and metal ions through coordinative bonds, hydrogen bonds andπ-πinteraction has been a fascinating research field owing to their potential applications in electronics, optics, magnetics, selective catalysis, molecular recognition, gas adsorption and hydrogen storage. The design and construction of metal-organic coordination polymers is of current interest in the fields of coordination chemistry, supramolecular chemistry and materials science. In the past decade, carboxylate ligands have been widely studied because of their strong coordination capability and varieties of coordination modes.According to the assembly principle of coordination polymer, we select 4,4'-biphenyldicarboxylic acid(H2BPDC) and (S)-(+)-mandelic acid(H2M) as building blocks to construct coordination polymers under the intervention of various metal ions and auxiliary ligands(organic amines). The different synthesis methods, the role of solvent, different pH values and reaction temperature to the products have been discussed.In this paper, twelve coordination polymers have been synthesized under solvothermal and solvent evaporation at temperature. They are [Pb(BPDC)](1),[Cd3(BPDC)4(Et4N)2] (2), [Cd3(BPDC)4(CC)2] (3),{In3(BPDC)5[H2N(CH3)2](H2O)2} (4), [Zn(HM)2(bpp)] (5), Cd2(bpp)3(μ2-Cl)2(μ-Cl)2 (6), [NaL2(H2O)2](H3O) (L=[B{O2CC(O)Ph}2]) (7) and other compounds contain NH4+ and alkali metal. They have been characterized by signal-crystal X-ray diffraction, IR, powder X-ray diffraction, TGA, elemental analysis and their luminescent property. The ferroelectric property of compound 7 and 11 was also investigated.