Study Of Coordination Polymers Constructed From Bis(Benzimidazole) Ligands

Coordination compounds of a wide range,and with various structures,which promise great potential in numerous fields.Although much progress in synthesizing coordination polymers has been made,it is still a great challenge to rationally control the resulting frameworks and properties owing to the multitude of influencing factors.Therefore,ten compounds were designed and synthesized utilized bis（benzimidazole） ligands,aromatic carboxylate co-ligands and metal salt.The structures of these complexes were characterized.Further,the influence of aromatic carboxylic ligands,N-donor ligands and metal ions on the final structures and properities were investigated.Four complexes were synthesized with 1,6-bis（2-methylbenzimidazol-1-yl） hexane（L1） and different aromatic carboxylic acids plus Ag（I）/Zn（Ⅱ）ions.Complex 1 possesses a 2D hcb network.Complex 2 features a 1D linear chain structure,and ultimately extended into 3D supramolecular network.Complex 3 possesses a 3D threefold interpenetration framework with coe topology.Complex 4 displays a 2D sql network.Cd（Ⅱ）/Ni（Ⅱ） compounds were synthesized by mixing different aromatic carboxylate acids with 1,6-bis（5,6-dimethylbenzimidazol-1-yl） hexane（L2） ligands under hydrothermal conditions.Complexes 5 and 7 are 2D hcb layers.Complex 6 shows a sra structure,which represents the first example of this topology based on the L2 ligand.Cd（Ⅱ）/Ni（Ⅱ） compounds were synthesized by mixing different aromatic carboxylate ligands with 1,6-bis（benzimidazol-1-yl） hexane（L3）.Complex 8 possesses a unique（3,4,5）-connected 3D framework with a point symbol of（4²·6²·7²·8⁴）（4²·6）（6⁴·8²）.Complex 9 forms a 3D sqc12 network.Complex 10 shows a CdSO₄ framework.Complexs 1¹0 exhibit high thermally stability and good fluorescent properity.Fluorescent sensing experiments reveal that complexes 5⁶ and 8 display efficient detection toward Fe³⁺and Cr₂O₇^2-in aqueous solution,respectively.Moreover,complexes 3,4,6,8 and 9 can serve as high-activity photocatalysts for degradation of methylene blue.Figure 69;Table 10;Reference 68...