A Pillar-Layered Zn-LMOF with Uncoordinated Carboxylic Acid Sites: High Performance for Luminescence Sensing Fe³⁺ and TNP

Abstract

By using the mixed-linker strategy, a new pillar-layered luminescence Zn-LMOF (JLU-MOF71) ([Zn2­Na2­(TPHC)­(4,4-Bipy)­(DMF)]·​8H2O) (TPHC = [1,1′:​2′,1″-ter­phen­yl]-3,­3″,­4,­4′,­4″,5′-hexa­car­boxylic acid, 4,4-bipy = 4,4-bipyr­i­dine, DMF = N,N-dimethyl­formamide) was successfully synthesized and structurally characterized. JLU-MOF71 is constructed by the 4,4-bipy pillars and 2D layers which consist of Zn2+ and TPHC ligands, and displays a rare fsh topology. Benefiting from the uncoordinated carboxylate sites in the framework, JLU-MOF71 not only can sensitively detect trace amounts of individual Fe3+ and 2,4,6-trinitrophenol (TNP) through luminescence quenching but also exhibits high selectivity when other competing analytes exist. Besides, TNP can also be effectively monitored with the help of the shifting direction of luminescent spectra (red shift) which has rarely been reported before. On the basis of the aforementioned, JLU-MOF71 can be considered as a potential luminescence sensor for detecting Fe3+ and TNP.

Two new NiII and ZnII metal–organic frameworks of glutarate and 1,4-bis[(2-methyl-1H-imidazol-1-yl)methyl]benzene ligands: syntheses, structures and luminescence sensing properties

“…absorbed by Fe 3+ or Cr 2 O 7 2À ions. Therefore, MOF (II) presents a quenching effect towards Fe 3+ and Cr 2 O 7 2À ions, which is consistent with the reported examples (Wen et al, 2016;Yu et al, 2019).…”

A New Compound for Sequential Sensing of Picric Acid and Aliphatic Amines: Physicochemical Details and Construction of Molecular Logic Gates

“…[8] Host-guest based competitive binding controlled aggregation-induced emission (AIE) method came handy in detecting PA. [9][10][11][12][13][14][15][16][17] Even carbon dotbased polypyrrole nanocomposites and sol-gel methods also proved beneficial for PA detection. [18][19][20][21][22][23][24][25] Moreover, modern day metal-organic-frameworks (MOFs) [26][27][28][29][30][31][32][33][34][35][36][37][38] and covalent-organicframeworks (COFs) [39][40][41] were found to provide good sensor materials for PA in different solvents. There are numerous small molecule sensors as well to detect PA with low LOD.…”

1,3-Di-naphthalimide Conjugate of Calix[4]arene as a Sensitive and Selective Sensor for Trinitrophenol and This Turns Reversible when Hybridized with Carrageenan as Beads

“… 12 The sensing of TNP has been majorly demonstrated either by electrochemistry or by fluorescence spectroscopy. 13 − 17 The latter is a widely accepted technique because of its real-time application and ease of handling. 18 − 20 In the literature, even the selective recognition of TNP has been demonstrated using metal–organic frameworks (MOFs), N-doped graphene oxide quantum dots, peptide-based gelators, and different supramolecular systems.…”

“… 18 − 20 In the literature, even the selective recognition of TNP has been demonstrated using metal–organic frameworks (MOFs), N-doped graphene oxide quantum dots, peptide-based gelators, and different supramolecular systems. 12 − 17 However, the molecular systems having a lower detection limit (LOD) with reversible sensing are in dire need and the hybridization of such systems with biologically benign polymers forming beads may add value for their multiple use readily. 21 − 24 …”