Three 3D metal coordination polymers based on triazol-functionalized rigid ligand: Synthesis, topological structure and properties

By using a triazol-functionalized tricarboxylate, three novel metal coordination polymers, namely, [Zn2L(OH)]center dot 0.5H(2)O (1), [Co2L(OH)(H2O)]center dot 5.5H(2)O (2), [Cu-2(HL)] (3) L = [ 5-(3-4-carboxypheny1)-5-methyl-4H-1,2,4-triazol-4-yl)isophthalate] were synthesized under hydrothermal reactions. All the compounds were characterized by element analysis, IR spectroscopy, thermogravimetric analysis, power X-ray diffrcation and single crystal X-ray diffrcation. Structural analysis reveals that compounds 1 and 2 have 3D networks with flu topologies where rigid trizaol-functionalized ligands as 4-connected nodes and Zn-4(COO)(6) or Co-4(COO)(6) clusters serves as 8-connected secondary building units. Compound 3 has 3D network with pcu topology where Cu-4(COO)(4) clusters serve as 6-connected secondary building units. Gas adsorption studies reveal that desolvated compoud 1 exhibits high H-2 absorption capacity at 77 K and highly selective separation abilities of CO2 and G(3)H(8) over CH4 at room temperature. The results suggest that 1 has potential application in gas storage and separation. In addition, the magnetic properties of compound 2 were also investigated.