Studies On The Syntheses, Structures And Properties Of The Metal Complexes With 3,6-bis(N-imidazolyl/benzimidazolyl) Pyridazine

Organic–metal coordination polymers have potential applications for adsorption, ion separation, catalysis, sensors and luminescence due to their various topologies, high surface areas and tunable chemical functionalities. In recent years, a wide variety of organic–metal coordination polymers with distinctive topological networks and special properties have been reported. In many influence factors of the structure of the coordination polymers, the structure of the organic ligand play a crucial role in coordination assembly.In this work, we designed and synthesized two related ligands 3,6-bis(N-imidazolyl)pyridazine(L1) and 3,6-bis(N-benzimidazolyl)pyridazine(L2). The ligands L1 and L2 reacted with different metal salts and successfully prepared twenty complexes. The crystal structures of complexes 1-20 have been characterized. The coordination performance of the two ligands have been studied. The fluorescent properties and photocatalytic properties of some complexes have been studied. Specific content as follows:1. The ligands 3,6-bis(N-imidazolyl)pyridazine(L1) and 3,6-bis(N-benzimidazolyl) pyridazine(L2) reacted with different metal salts and successfully prepared seven Zn(II), Cd(II) complexes, namely [Zn(L1)4(OH)2](1), {[Zn(L1)(Ac O)2]·CH3CH2OH}∞(2), {[Zn(L1)(H2O)4]·SO4}∞(3), [Cd(L1)4(OH)2](4), [Cd(L1)4(OH)2](5), {[Cd(L1)(H2O)4]·Si F6}∞(6), [Cd(L2)(NO3)2]∞(7). The crystal structures of complexes 1-7 have been characterized. The fluorescent properties and photocatalytic activities of complexes 1-7 have been investigated and discussed.2. The ligands 3,6-bis(N-imidazolyl)pyridazine(L1) and 3,6-bis(N-benzimidazolyl)pyridazine(L2) reacted with different metal salts and successfully prepared eight Co(II) complexes, namely [Co(L1)4(OH)2](8), {[Co(L1)(H2O)4]·2Cl O4}∞(9), {[Co(L1)(H2O)4]·Si F6}∞(10), {[Co(L1)3]·2Cl O4}∞(11), {[Co(L1)3]·2BF4}∞(12), [Co(L2)Cl2]∞(13), {[Co(L2)2]·Si F6}∞(14), {[Co(L2)2]·2PF6}∞(15). The crystal structures of complexes 8-15 have been characterized. The fluorescent properties and photocatalytic activities of complexes 8-15 have been investigated and discussed.3. The ligands 3,6-bis(N-imidazolyl)pyridazine(L1) reacted with different metal salts and successfully prepared five complexes of Cu(II), Mn(II), Ni(II), namely [Mn(L1)4(OH)2](16), {[Mn(L1)(H2O)4]·SO4}∞(17), {[Cu2(L1)2(SO4)2(H2O)2]·H2O}∞(18), [Cu(L1)2(Si F6)]∞(19), [Ni(L1)4(OH)2](20). The crystal structures, powder diffraction and thermodynamic stability of complexes 16-20 have been characterized and researched.