Metal-organic frameworks based on flexible bis(imidazole) and dicarboxylic ligands and their applications as selective sensors for magnesium nitrate. (1st March 2020)

• Record Type: Journal Article
• Authors: Li, Xianglin; Huang, Kun; Peng, Mengni; Han, Defang; Qiu, Qi; Jing, Linhai; Qin, Dabin
• Is Part Of: Polyhedron. Volume 178(2020)
• Publication Date: 2020-03-01
• Subjects: Metal-organic frameworks -- Bis(imidazole) -- Fluorescence -- Magnesium nitrate; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2020.114349
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Three new MOFs were constructed through hydrothermal synthesis, which exhibited high selectivity towards magnesium nitrate among various metal nitrates via fluorescence quenching. Highlights: Two Co-MOFs were prepared with fantastic 3D porous structures. A Cd-MOF was synthesized with a fantastic hexa-nuclear Cd cluster. All MOFs exhibited high selectivity towards Mg(NO3 )2 among various metal nitrates. Abstract: Three new MOFs, namely {Co2 (Bbi)2 (A)2 ·H2 O}n (1 ), {Co(Bbi) (B)2 ·4H2 O)}n (2 ) and {Cd6 (Bbi)1.5 (L)6 ·5H2 O}n (3 ) [Bbi = 1, 1′-(1, 4-butanediyl)bis(imidazole), H2 L = (anthracene-9, 10-endo-succinic acid), H2 A = (benzopheno-4, 4-dicarboxylic acid), H2 B = (1, 2-diethyl ether-4, 4′-dibenzoic acid)], have been constructed through hydrothermal synthesis. 1 exhibits a double interpenetrating 3D to 3D cds topology network with point symbol of {6 5. 8}. 2 forms a large 3D channel by ligand Bbi connected 2D adjacent waveform layers, displaying 4-connected net with sql topology defined by the point symbol of {4 4 ·6 2 }. A rare hexa-nuclear Cd cluster can be observed in the structure of 3 with a Schläfli symbol of {4 2 ·6}2 {4 3 ·10 3 }{4 3 ·6·8 2 }{4 3 ·6 3 }{4 4 ·6 2 }2 {4 5 ·6 2 ·8 2 ·10}{4 6 }4 . TG analyses indicate the highly thermal stability of 1 –3 . More importantly, MOFs 1 –3 can be developed as fluorescent sensors, which show high selectivity towards magnesium nitrate among various metal nitrates in CH3 CN by fluorescence quenching, presenting as promising candidates for chemical sensing.