Unsaturated Dicarboxylic Acid Metal Organic Coordination Polymer Molecular Construction

In this thesis, fifteen coordination polymers have been synthesized by the normal temperature method or hydrothermal (solvothermal) reactions of acetylenedicarboxylic acid or trans-4,4'-stilbene dicarboxylic acid with many metal salts. The study on synthetic conditions and topological analyses of some coordination polymers are carried out. These complexes structurally characterized by single crystal X-ray diffraction and the thermal stabilities and fluorescent properties of some complexes have been studied. In eight new low dimensional coordination polymers, the different length of acetylenedicarboxylic acid and trans-4,4'-stilbene dicarboxylic acid may give great influence on the final structures, for example 1 and 2 have nearly linear structures, whereas 5, 6, 7 are zigzag structures. In four new interpenetrated three-dimensional coordination polymers, the volume of central metal node may be relevant to the numbers of interpenetration. For example, 2-fold interpenetrating 9 and 10 are all constructed from rod-shaped secondary building units, and 3-fold interpenetrating 11 consist of trinuclear clusters, whereas the nodes of 9-fold interpenetrating 12 are mononuclear metal ions. In three rare earth coordination polymers, the carboxyl and phenyl groups are nearly coplanar in the complex 13, whereas the dihedral angel between carboxyl and phenyl groups in complex 14 and 15 are bigger than that in 13. The trans-4,4'-stilbene dicarboxylic acid can act bidentate (η2,μ2),tridentate (η3,μ2),tetradentate (η4,μ4)(η4,μ2),pentadentate (η5,μ4) to coordinate to metal ions, and the pentadentate (η5,μ4) mode is discovered firstly. So we conclude that the trans-4,4'-stilbene dicarboxylic acid can have abundant and various coordination modes as a typical dicarboxylic acid ligand.