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The design and synthesis of new functional complexes is a hot research field, one of today's coordination chemistry, crystal engineering, supramolecular chemistry, not only because they have a novel topology, but also because they are light, electricity and magnetism, demonstrate the great potential for application in areas such as catalysis and molecular recognition. The work of this dissertation is the foothold carried out in this field has broad application prospects. A wide variety of carboxylic acid ligands, coordination variety, so the use of crystal engineering principles for the design and synthesis of structure primitives metal-organic complexes metal ions and polycarboxylic acid rapid development, has made many very The eye-catching results. But most of the literature reports on the rigid acids ligands, such as 1,3,5 - benzene tricarboxylic acid, 1,2 - benzenedicarboxylic acid, 1,3 - benzenedicarboxylic acid, 1,4 - benzenedicarboxylic acid , 1,2,4,5 - pyromellitic acid, and 2,6 - naphthalene dicarboxylic acid and so on. Flexible polybasic carboxylic acid and the semi-rigid V-shaped polycarboxylic acid ligand group reported assembly polymer not much, because the flexible ligand as a ligand to the polymer construction unit due to its conformation and ligand type multiple denaturation, provides more possibilities for the design and synthesis of complexes with novel structure and nature. In recent years, the study of the multi-dimensional mesh complex transition metal with nitrogen-containing ligands has attracted widespread attention. It with a metal can be formed in a self-assembly process because the the nitrogenous ligand itself has excellent ligands and bridging characteristics, the structure of the complexes of the various space. Therefore, we designed and synthesized four flexible bis imidazole ligands of 1,4 - bis (imidazol-1 - methyl) benzene (BIX), 1,3 - bis (imidazol-1 - methyl) benzene (mbix) 1,2 - bis (imidazol-1 - methyl) benzene (oBIX), 4,4 '- bis (imidazol-1 - methyl) biphenyl (bimb). In this thesis is to use these nitrogenous ligands and seven kinds of organic acid synthesis had been reported 15 kinds of complexes: the Co. 5 (the μ 3 -OH) < sub> 2 (1,4-BDC) 3 (BTA) 2 (1), [Co (1,4-CDC) 0.5 (BTA)] (2), Zn (SDBA) (obix) (3), Zn (SDBA) (obix) · 0.25H 2 O (4), Cd (BIPA) (daf) (H 2 O) 3 ] · 2H 2 O (5), [Cd 2 ( BIPA) 2 (pdon) 2 ] · H 2 O (6), Zn 2 (DPA) < sub> 2 (mbix) (H 2 O) (7), Cd2 (DPA) 2 (mbix) (8), Co (SDBA) ( bimb) (9), Co (SDBA) (obix) (10), Cd (SDBA) (bimb) (11), Cd2 (FA) (2,2 '-bipy) (12), Zn 2 < / sub> (SA) (bimb) (13), Cd (SDBA) (timb) · 3H 2 O (14) and Cu (H 2 FA) (2 , 2'-bipy) · 1.54 (H 2 O) (15), its crystal structure and the nature of the characterization. Metal ion, the synthesis temperature, the ligand structure and the pH value of the complex structure. 5 complexes of the second-order nonlinear and ferroelectricity been studied.
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