Four Novel d10 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.