Molecular Construction Of The New Flexible Polypyridyl Amine Coordination Polymer Materials And The Nature Of The Study

In this thesis, four flexible bis(pyridyl) ligands with amido groups have been prepared, and the reactions of the above ligands with transition metal salts lead to the formation of sixteen new complexes by self-assembly or hydrothermal (solvothermal) methods, exhibiting from zero-dimensional (0-D) to three-dimensional (3-D) frameworks. All the complexes were structurally determined by single crystal X-ray diffraction and some complexes were characterized by element analysis, IR and PL spectrum. The structures of these complexes are profoundly influenced by the flexible nature of their spacer. These ligands can exhibit the formation of either discrete complexes for the cis conformation (complex 5, 7, 16) or infinite coordination networks for the trans conformation (complex 1-4, 6, 8-12). Meanwhile, the silver(I) and zinc(II) ions having tetrahedral geometry tend to construct helical structures. For example, complexes 2, 3 and 6 have 1-D helix-like chain structures, and complexes 1, 4 and 14 are 2-D or 3-D frameworks including helical chains. The introduction of co-ligand PPh3 to the system of high-dimensional complex (3-D complex 1) results in the formation of low-dimensional complex (1-D complex 2). Moreover, the choice of inorganic counterions also gives great influence on the final structures of the complexes.