AUTHOR=Xie Wang , Wu Jie , Hang Xiaochun , Zhang Honghai , shen Kang , Wang Zhoulu 

TITLE=Four Novel d10 Metal-Organic Frameworks Incorporating Amino-Functionalized Carboxylate Ligands: Synthesis, Structures, and Fluorescence Properties

JOURNAL=Frontiers in Chemistry

VOLUME=9

YEAR=2021

URL=https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2021.708314

DOI=10.3389/fchem.2021.708314

ISSN=2296-2646

ABSTRACT=<p>By employment of amino-functionalized dicarboxylate ligands to react with d<sup>10</sup> metal ions, four novel metal-organic frameworks (MOFs) were obtained with the formula of {[Cd(BCPAB)(<italic>μ</italic><sub>2</sub>-H<sub>2</sub>O)]}<sub><italic>n</italic></sub> (1), {[Cd(BDAB)]∙2H<sub>2</sub>O∙DMF}<sub><italic>n</italic></sub> (2), {[Zn(BDAB)(BPD)<sub>0.5</sub>(H<sub>2</sub>O)]∙2H<sub>2</sub>O}<sub><italic>n</italic></sub> (3) and {[Zn(BDAB)(DBPB)<sub>0.5</sub>(H<sub>2</sub>O)]∙2H<sub>2</sub>O}<sub><italic>n</italic></sub> (4) (H<sub>2</sub>BCPAB = 2,5-bis(p-carbonylphenyl)-1-aminobenzene; H<sub>2</sub>BDAB = 1,2-diamino-3,6-bis(4-carboxyphenyl)benzene); BPD = (4,4′-bipyridine); DBPB = (<italic>E,E-</italic>2,5-dimethoxy-1,4-bis-[2-pyridin-vinyl]-benzene; DMF = <italic>N</italic>,<italic>N</italic>-dimethylformamide). Complex 1 is a three-dimensional (3D) framework bearing <italic>seh</italic>-3,5-<italic>Pbca</italic> nets with point symbol of {4.6<sup>2</sup>}{4.6<sup>7</sup>.8<sup>2</sup>}. Complex 2 exhibits a 4,4-connected new topology that has never been reported before with point symbol of {4<sup>2</sup>.8<sup>4</sup>}. 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<sup>2+</sup> and complex 3 could detect Cu<sup>2+</sup> and Ag<sup>+</sup><italic>via</italic> quenching effect.</p>