.4 - Formylbenzoate Molecular Construction And Properties Of Metal Complexes

In this thesis, thirty metal complexes have been synthesized by the assembly of 4-formylbenzoic acid with different metal salts. The study on synthetic conditions of these complexes and their topological analyses were carried out. All the complexes were structurally characterized by single crystal X-ray diffraction and some complexes were characterized by TG and PL. The interaction of large numbers of water molecules in complexes could give diverse water clusters, which can construct novel topological structure through interacting with metal-ligand units, such as pcu topology of complexes 2, 3, 4 and (44.62)(410.64.8) topology of complex 5. Water molecules in complex 7 formed rarely water chains with single-helix and double-helixes. The introduction of co-ligands might play a crucial role in the topological structure of final targets. Imidazole and hydroxypyridine which have small special volume and hydrogen proton can form high-dimensional supramolecular polymer by hydrogen-bonding interaction, whereas large and conjugated ligands, such as benzimidazole, 2,2'-bipyridine and 1,10-phenanthroline, may create supramolecular polymer through theπ-πstacking interaction. Bridging ligand hexamethylenetetramine can easily form coordination polymer by using its four nitrogen atoms. 4-Formylbenzoic acid exhibits various monodentate, bidentate (μ₂-η²), tridentate (μ₂-η³;μ₃-η³) and tetradentate [μ₃-η⁴_(carboxyl)andμ₃-η⁴_{(carboxyl+formyl)}] fashions, in which the formyl monodentate mode and tetradentate [μ₃-η⁴_{(carboxyl+formyl)}] mode only appeared in the Ba complexes.