期刊
ACS OMEGA
卷 7, 期 45, 页码 41370-41391出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsomega.2c05179
关键词
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资金
- RUSA
- DST-PURSE 2
- Council of Scientific and Industrial Research New Delhi, India [09/100(0234)/2019-EMR-I, 09/100(0220)/2018-EMR-I, 09/100(0233)/2019-EMR-I]
- MICIU/AEI of Spain (FEDER funds) [PID2020-115637GB-I00]
- [RA/SA/URS-Ph.D/275/22]
In this study, the interaction between nitroaromatic compounds and Ln-CPs was investigated to develop a selective and sensitive system for the sensing of nitroaromatics. CP 4 showed high sensitivity for the detection of p-nitrotoluene.
Lanthanide coordination polymers (Ln-CPs) are potential chemosensors when fabricated to depict a detectable change in optical properties on interaction with target analytes. This work investigates the interaction of nitroaromatic compounds with Ln-CPs leading to induced changes in fluorescence emission intensity, a crucial strategy to develop a selective and sensitive system for the sensing of nitroaromatics. Approaching toward this objective, solvothermal reactions of 2,5-thiophenedicarboxylic (2,5TDC) acid, 1,10-phenanthroline (1,10-Phen), and Ln(NO3)3 center dot xH2O are carried out to assemble eight Ln(III) coordination polymers [Ln2(2,5-TDC)3(1,10-Phen)2(H2O)2] [Ln = Pr (1), Nd (2)], {[Tb(2,5-TDC)1.5(1,10-Phen)(H2O)]center dot DMF} (3), and [Ln(2,5-TDC)1.5(1,10-Phen)]center dot xH2O (Ln = Tb (4), Dy (5), Ho (6), Er (7), and Yb (8)); x = 0 for CP 4, 5, 6, and 8 and x = 1 for CP 7 with two different space groups and dimensions. The as-synthesized polymers 1-8 are characterized by powder X-ray crystallography, infrared spectroscopy, and thermogravimetric analysis. The structure-corroborated density functional theory (DFT) studies are done on the selected CPs to investigate the interactions between different structural motifs of the assembled CPs. The luminescence properties of CP 4 are explored in detail and are found to be highly sensitive for the detection of p-nitrotoluene as indicated by the most intensive fluorescence quenching with the lowest limit of detection (0.88 ppm) and high quenching constant (4.3 x 104 M-1). Other nitro compounds (viz., o-nitrobenzaldehyde, m-nitroaniline, picric acid, mdinitrobenzene, p-nitrophenol, and p-nitroaniline) are also screened for potential sensing by CP 4.
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