Four Novel d(10) Metal-Organic Frameworks Incorporating Amino-Functionalized Carboxylate Ligands: Synthesis, Structures, and Fluorescence Properties

By employment of amino-functionalized dicarboxylate ligands to react with d(10) metal ions, four novel metal-organic frameworks (MOFs) were obtained with the formula of {[Cd(BCPAB)(μ (2)-H(2)O)]}(n) (1), {[Cd(BDAB)]∙2H(2)O∙DMF}(n) (2), {[Zn(BDAB)(BPD)(0.5)(H(2)O)]∙2H(2)O}(n) (3) and {[Zn(BDAB)(DBPB)(0.5)(H(2)O)]∙2H(2)O}(n) (4) (H(2)BCPAB = 2,5-bis(p-carbonylphenyl)-1-aminobenzene; H(2)BDAB = 1,2-diamino-3,6-bis(4-carboxyphenyl)benzene); BPD = (4,4′-bipyridine); DBPB = (E,E-2,5-dimethoxy-1,4-bis-[2-pyridin-vinyl]-benzene; DMF = N,N-dimethylformamide). Complex 1 is a three-dimensional (3D) framework bearing seh-3,5-Pbca nets with point symbol of {4.6(2)}{4.6(7).8(2)}. Complex 2 exhibits a 4,4-connected new topology that has never been reported before with point symbol of {4(2).8(4)}. Complex 3 and 4 are quite similar in structure and both have 3D supramolecular frameworks formed by 6-fold and 8-fold interpenetrated 2D coordination layers. The structures of these complexes were characterized by single crystal X-ray diffraction (SC-XRD), thermal gravimetric analysis (TGA) and powder X-ray diffraction (PXRD) measurements. In addition, the fluorescence properties and the sensing capability of 2–4 were investigated as well and the results indicated that complex 2 could function as sensor for Cu(2+) and complex 3 could detect Cu(2+) and Ag(+) via quenching effect.