Synthesis, structure and properties of a new three-dimensional interpenetrated metal-organic framework with 3,300-azodibenzoic acid (H2azdc) and 1,4-bis(1H-imidazol-1-yl)butane (bimb): {[Cd(azdc)(bimb)2] H2O}n

摘要

A new three-dimensional interpenetrated CdII-organic framework based on 3,30-azodibenzoic acid [3,30-(diazenediyl)dibenzoic acid, H2azdc] and the auxiliary flexible ligand 1,4-bis(1H-imidazol-1-yl)butane (bimb), namely poly-[[bis[/x2-l,4-bis(li/-imidazol-l-yl)butane-/c2Af3:Af3][/x2-3,3'-(diazenediyl)diben-zoato-K2O:O']cadmiuni(II)] monohydrate], {[Cd(C14H8N2O4)(C10H14N2)2]-H2O}n, (1), was obtained by a typical solution reaction in mixed solvents (water and N,N0-dimethylformamide). Each CdII centre is six-coordinated by two O atoms of bis-monodentate bridging carboxylate groups from two azdc2~ ligands and by four N atoms from four bimb ligands, forming an octahedral coordination environment. The CdII ions are connected by the bimb ligands, resulting in two-dimensional (4,4) layers, which are further pillared by the azdc2~ ligands, affording a threefold interpenetrated three-dimensional a-Po topological framework with the Schlafli symbol 4 263. The thermal stability and solid-state fluorescence properties of (1) have been investigated.