Study On Coordination Polymers Of 2- (4 - Carboxylbenzoyl) Benzoic Acid And Their Crystal Transformation

Currently, coordination polymers have been extensively studied for their performance in the light, electricity, magnetic properties, gas storage, chemical sensing, catalysis and so on. The construction of coordination polymers is sensitive to many synthetic factors, so controling the external factors and realizing the self-assembly of metal ions and organic ligands targetedly is still a challenge to the scientists. Therefore, it is significant to research the influence of external factors on the coordination configuration of ligand through controlling variables method. Besides, structural transformation has aroused wide concern and emerged as a promising approach for the design and synthesis of novel coordination polymers, since it provides some crucial clues to gain intensive understanding on the fundamental external stimuli:temperature, mechanical force, solution, reaction time, guest molecule, electromagnetic irradiation and so on.In this work, the 2-(4-carboxybenzoyl)benzoic (H2cbb) has been chosen as the main building block, and successfully construct 15 coordination polymers:[Ni(cbb)(phen)]n (1), [Co(cbb)(phen)]n (2), [Cd(cbb)(phen)]n (3), [Mn(cbb)(phen)]n (4), [Cd2(cbb)2(bpp)3]n·11nH2O (5), [Co2(cbb)2(bpp)]n-nH2O (6), [Ni(cbb)(phen)(H2O)2]n (7), [Cd(cbb)(H2O)]n (8), [Cd(cbb)(bpa)]n (9), [Cd(cbb)(2,2’-bipy)]n·nH2O (10), [Cd(cbb)(4,4’-bipy)o.5(H20)2]n (11), [Ni(cbb)(4,4’-bipy)(H2O)2]n (12), [Ni(cbb)(4,4’-bipy)o.5]n (13), [Ni(cbb)(4,4’-bipy)]n (14), [Ni(cbb)(4,4’-bipy)1.5]n·nH2O (15). The structures of were confirmed by single crystal diffraction, and were characterized by powder diffraction, infrared spectra, elemental analyses and thermogravimetric analyses (TGA). The potential luminescence and magnetic properties of some compounds have also been tested and investigated. Additionally, we choose four points, metal ions, auxiliary ligand, reaction temperature and solvent medium, to investigate the coordination configuration of main ligand and the final structure of coordination polymers in detail.