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A rod In-MOF (JOU-25) constructed from a 4,4′,4′′-triphenylamine tricarboxylic acid ligand has been solvothermally synthesized. Single-crystal X-ray diffraction shows that JOU-25 displays a three-dimensional framework with two types of unique homochiral In–O–In helical chains. Due to its strong fluorescence emission and exposed uncoordinated carboxyl groups within channels, JOU-25 was developed as a highly sensitive fluorescence sensor for detecting Cu2+, Fe3+ and nitroaromatics in water. These results indicate that JOU-25 holds potential applications in the development of new fluorescence sensing materials. This work also provides a new clue for the construction of chiral MOFs based on rod-shaped building blocks. [ABSTRACT FROM AUTHOR]

A newly pyrene functionalized zinc(II)-MOF was solvothermal synthesized and developed for fluorescence sensing of nitroaromatic compounds due to its good photoluminescence properties. [Display omitted] In this work, a zinc(II)-based metal–organic framework, namely [Zn 2 (TBAPy)(H 2 O)(DMF)]·4DMF·2H 2 O (JOU-34) (TBAPy = 1,3,6,8-tetrakis (p-benzoic acid) pyrene; DMF = N,N'-Dimethylformamide), has been solvothermally synthesized and characterized. Single-crystal X-ray diffraction shows that JOU-34 displays three-dimensional microporous framework with rare topology. Due to the introduction of pyrene groups, JOU-34 shows strong fluorescent emission cantered at about 470 nm. Furthermore, it shows a good fluorescence sensing performance toward nitroaromatic compounds, especially nitrobenzene (NB). Although the NB concentration was only 8.33 × 10−4 M, the quenching efficiency can reach 89 %. Further studies show that the quenching effect of JOU-34 in the presence of nitroaromatics may be attributed to the fluorescence resonant energy transfer and electron transfer between nitroaromatics and JOU-34. These results indicate that JOU-34 can be applied as a functional material for nitroaromatics detection. [ABSTRACT FROM AUTHOR]

A microporous indium-based metal-organic frameworks (MOFs), namely [(CH 3) 2 NH 2 ] 2 [In 2 (H 3 L) 2 (OX)]·3DMF·2H 2 O (JOU-23) (H 3 L ​= ​terphenyl-3, 4′, 5-tricarboxylic acid; OX ​= ​oxalic acid), have been solvothermal synthesized and characterized. Single-crystal X-ray diffraction show that JOU-23 displays three-dimensional anionic framework with 2-fold interpenetrated nets and rare topology. Due to its anionic and porous framework, JOU-23 can be developed for effective absorbing and separating cationic organic dyes. Further studies reveal that both the charge and size of dye molecules would affect the dyes' absorption and separation. In addition, JOU-23 dispersed in dimethyl formamide shows strong emission at about 364 ​nm. Thus, it was developed as an efficient fluorescent sensor for probing Fe3+ ions and nitroaromatic compounds. The detection limit of Fe3+ is as low as 2 ​× ​10−6 ​M (K SV ​= ​59,755 ​M−1), which is excellent in MOFs fluorescent probe. At the same time, JOU-23 shows widespread sensing performance to nitroaromatic compounds. Especially, the detection ability of JOU-23 for nitrobenzene (NB) is good. Although the NB concentration reaches only 4.175 ​× ​10−5 ​M, the quenching efficiency can achieve 86.4%. Further studies show that the quenching performance of JOU-23 is mainly attributed to the competition of excitation light absorption and the absorption of emission light by measured objects. These results indicate that JOU-23 can be applied as a multifunctional material for organic dyes adsorption/separation, Fe3+ ions detection, and nitroaromatic compounds sensing. A microporous anionic 2-fold interpenetrated In(III)-MOF has been synthesized and developed as multifunctional materials for organic dyes adsorption/separation and fluorescent sensitization of Fe3+ ions and nitroaromatic compounds. [Display omitted] • A microporous In-MOF with 2-fold interpenetrated anionic framework has been solvothermal synthesized. • JOU-23 represents a rare (3,6)-connected topology with the Schläfli symbol of (4·62) 2 (42·610·83). • JOU-23 can selective absorption and chromatographic separation of cationic dyes. • JOU-23 has been utilized as an efficient fluorescence "turn-off" sensor for probing Fe3+ ions and nitroaromatic molecules. [ABSTRACT FROM AUTHOR]