Abstract
A Zn(II)-based metal–organic framework (MOF) decorated with amine and azine functionalities, TMU-17-NH2 (formulated as [Zn(H2ata)(L)].2DMF; L = 1,4-bis(4-pyridyl)-2,3-diaza-2,3-butadiene and H2ata = 2-aminoterephthalic acid) has been successfully synthesized via a solvothermal method. According to crystallographic studies, the synthesized TMU-17-NH2 has three dimensional cuboidal structure with the pore surface decorated with free amine (-NH2) and azine (= N–N =) functional groups. The photoluminescence investigations proved that the synthesized MOF can be effectively utilized for selective detection of 2,4,6-trinitrophenol (TNP) in water with an apparent turn-off quenching response. Its limits of detection (LOD) for TNP was 9.4 ppb and competitive nitro explosive testing confirmed its higher selectivity towards TNP (over other nitro explosives). Calculations based on density functional theory (DFT) and spectrum overlap were utilized to evaluate the sensing mechanisms. This MOF-based fluorescence sensing technique for TNP had a high sensitivity (Ksv = 3.26 × 104 M−1).
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References
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Acknowledgements
The authors thank the Chemistry Department, Punjabi University, Patiala, for providing the laboratory and instrument facilities. Manpreet Kaur is also grateful for the UGC-SRF fellowship, UGC, New Delhi, India.
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Manpreet Kaur has performed the experiment and written the paper. Ashok Kumar Malik has supervised and reviewed the whole work.
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Highlights
• TMU-17-NH2 sensor decorated with amine and azine functionalities was synthesized.
• TMU-17-NH2 identified the TNP in water via turn-off quenching response.
• Turn-off response was explained both experimentally and theoretically.
• LOD of TMU-17-NH2 for TNP sensing was 9.4 ppb.
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Kaur, M., Malik, A.K. Hazardous 2,4,6-Trinitrophenol (TNP) Detection in Water by Amine and Azine Functionalized Metal–Organic Framework. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03751-4
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DOI: https://doi.org/10.1007/s10895-024-03751-4