Syntheses,Staictures And Properties Of Metal-Organic Frameworks Based On Carbazole Derivatives

Compared with traditional porous materials,metal-organic frameworks(MOFs)have unique advantages such as high specific surface area(10400 m2 g-1),high porosity(98 A)and low density(0.13 g cm-3).It is undoubtedly that study on MOFs is one of the most active research areas in chemical and materials,not only because of the fascinating structures of MOFs,but also because of their potential applications in various fields,such as gas storage and separation,fluorescence sensing,drug delivery,photocatalytic degradation,electromagnetic material,etc.The main research contents of the paper are as follows:1?Using a flexible polydentate carboxylic acid ligand 9-(3,5-dicarboxy-benzyl)-9H-carbazole-3,6-dicarboxylic acid(H4DCDC)?Co(NO3)2·6H2O and Mg(OH)2 to synthesize a bimetallic organic framework[MgCo(DCDC)(H2O)3](1)with 3D structure under solvothermal conditions.Complex 1 has strong fluorescence,adding Cd2+ will greatly increase its fluorescence intensity while adding a small amount of Fe3+,the fluorescence intensity will be reduced.In addition,complex 1 has a highly selective adsorption effect towards Cu2+.2?A 2D bimetallic organic framework[ZnCd(DCDC)(DMA)(H2O)](2)was synthesized through solvothermal method by using Zn(NO3)2·6H2O?CdCl2 and ligand H4DCDC(DMA=N,N-Dimethylacetamide).Complex 2 can adsorb and separate dyes well,especially the adsorption rate of methylene blue increases with time.After the adsorption experiment by simply treatment with complex 2,it can adsorb methylene blue again.3?By combining of H4DCDC with MnCl2·4H2O,[Mn(H2DCDC)(DMF)](3)was synthesized(DMF=N,N-Dimethylformamide).Complex 3 was a 2D chain with water stability and can emit strong fluorescence.Li+and Zn2+ can enhance the fluorescence of 3 while Cu2+,Pb2+ and Fe3+ can quench the fluorescence.4?Reactions of H4DCDC and CoCl2·6H2O can give rise to a 2D metal-organic framework[Co(H2DCDC)(H2O)2](4)under solvothermal conditions.The Co1-xS nanoparticles embedded in N-doped carbon sheets(Co1-xS/NCS)composites were obtained via vulcanizing complex 4.As a result,the Co1-xS/NCS exhibits outstanding cycling stability and maintains a high capacity of 796.3 mA h g-1 at the current density of 200 mA g-1 after 100 cycles.