Synthesis, Structure And Properties Of Coordination Polymers Based On Linear Azaeyclic Ligands

The rise of functional complexes and molecular self-assembly changed the old concept of inorganic chemistry greatly in the breadth and the depth. Numerous novel inorganic compounds have been reported, researched and promoted as the development of inorganic chemistry, organic chemistry, material chemistry, structural chemistry, biochemistry, and other edge in the field. We walk further and further on the molecular self-assembly road because of the interweaving of major disciplines, the more scientific experiment method and the more advanced research technology.In view of this, my research work is developed on the basis of previous studies, and the work is composed of:1. L¹₁,4-bis（imidazole-1-ylmethyl）benzene has been synthesized from α,α′-dichloro-p-xylene and imidazole; L²₁,4-bis（1,2,4- triazol-1-ylmethyl）benzene has been synthesized from α,α′-Dichloro-p-xylene and 1,2,4-triazol. L⁴₄-（1H-tetrazol-5-yl）benzoic acid has been synthesized by [²⁺₃] cyclo-condensation between 4-cyanobenzoic acid and Na N₃, Zn Br₂. All these ligands have been characterized by IR and elemental analysis. Some metal salts such as（Mn（ClO₄）₂?6H₂O, Cu（ClO₄）₂?6H₂O, Cu（NO₃）₂?3H₂O） and the rare earth metal salt（La（NO₃）₂?6H₂O） have been synthesized too.2. Using these linear azaeyclic ligands and metal salts, six different crystal structures of coordination polymers were synthesized under the condition of hydrothermal reaction. These new coordination polymers were listed in the following: Complex 1 Mn L¹₃（ClO₄）₂ ? 2H₂O; Complex 2 Cu L² ClO₄; Complex 3 Cu L²₂ Cl₂; Complex 4 Cu L¹ ClO₄; Complex 5 Cu₂ L³ Cl; Complex 6 La₂ L⁴₄ O₁₈ ? 7H₂ O. The crystal structures of complexes 1 – 6 were analyzed respectively. Their crystal data and crystal structure diagram have also been listed.3. The fluorescent properties of complexes 1 – 6 were studied. First, the best test condition for fluorescent was found, then the fluorescent intensity of the complexes were compared with the corresponding ligands. We focuses on the metal selectivity of the complexes, and we found that these six complexes are quite senstive with Fe³⁺、Cu²⁺、Pb²⁺、Hg²⁺. The titration curves for the selected metal ions were studied, and the minimum detection limits of the metal ions of six complexes were calculated. We found that these six complexes can be used in ion detection.