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Isostructural, pillar-layered metal–organic frameworks (MOFs) will provide an ideal structural model for studying the influence of functional groups on fluorescence sensing. Here, we study dipyridyl linkers to tune the detection of Fe3+ ions. Three isostructural analogues of pillar-layered frameworks were used as fluorescence sensors to quickly, sensitively, and selectively detect Fe3+ ions with good repeatability. Importantly, an increase in length of the pillars and accessible volumes may lead to an increase in the fluorescence quenching constants (Ksv(PL-1) = 1.58 × 104 M−1) < (Ksv(PL-2) = 1.72 × 104 M−1) < (Ksv(PL-3) = 2.47 × 104 M−1), which may be related to different dipyridyl ligands acting as pillars. [ABSTRACT FROM AUTHOR]

A three-dimensional (3D) metal–organic framework [(CH3)2NH2][Zn2(DMTDC)2(3-mtz)]·4DMF·3H2O (Zn-MOF) has been solvothermally synthesized by using mixed ligands of 3-methyl-1,2,4-triazole (3-Hmtz) and a thiophene-functionalized dicarboxylate ligand, 3,4-dimethylthieno[2,3-b]thiophene-2,5-dicarboxylic acid (H2DMTDC). Zn-MOF exhibits a uninodal 6-connected pcu α-Po topology structure and possesses an anionic framework with large 1D-trapezoidal channels. Gas adsorption studies reveal that the activated Zn-MOF-a displays selective adsorption of CO2 over N2 at 273 K and 298 K as well as a high isosteric heat of CO2 adsorption. Moreover, Zn-MOF shows selective adsorption of the cationic dyes over the anionic and neutral dyes, and can be used as a fast-response and sensitive probe for the detection of Fe3+ by fluorescence quenching after encapsulation of Tb3+ into the pores by postsynthetic cation exchange. [ABSTRACT FROM AUTHOR]

A luminescent cadmium metal–organic framework functionalized with uncoordinated triazolate N-donors has been constructed by using a triazolate–carboxylate bifunctional organic ligand. It exhibits selective adsorption of CO2 over N2 behavior, and interesting guest-dependent photoluminescence properties. [ABSTRACT FROM AUTHOR]