Abstract
The combination of diazabicyclic compound i.e. 1,4-diazabicyclo[2.2.2]octane (DABCO) and dicarboxylate linker 1,4-dicarboxylic acid are employed to self-assemble with three divalent metal ions such as Zn2+, Cd2+, Ni2+ led to the formation of highly stable pillar layered luminescent metal–organic frameworks. The emissive response of as-synthesized MOFs was studied in organic solvents with different functionalities resulting in the development of fluoroprobes having excellent recognition ability for 4-nitroaniline with detection limit upto micromolar. All the MOFs display a good linear relation between the fluorescence intensity and concentration of 4-NA in the range of 10–90 µmol L−1. The values of Ksv for Zn-MOF, Cd-MOF, and Ni-MOF are found to be 1.75 × 104 mol−1L, 1.25 × 104 mol−1L, and 28.0 × 104 mol−1L, respectively. The calculated detection limit values are 19.7 µmol L−1, 27.6 µmol L−1, and 1.19 µmol L−1 respectively. Moreover, the study was further extended to fabricate the solid membrane-based fluoroprobe using a linear chitosan polysaccharide and act as an efficient solid fluoroprobe for the detection of 4-NA. This proposed synthesis of polymeric membrane facilitates the MOF@chitosan fluorophore to transfer its fluorescence-emissive nature to a solid state.
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Funding
This work was financially supported by the Council of Scientific & Industrial Research (CSIR). The authors also appreciate the great support by the Sant Longowal Institute of Engineering & Technology to accomplish this work.
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All authors contributed to the study’s conception and design. Material preparation, data collection, and analysis were performed by Gagandeep Kaur. The first draft of the manuscript was written by Gagandeep Kaur and all authors commented on previous versions of the manuscript. Dr. Dhiraj Sud read and approved the final manuscript.
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Kaur, G., Sud, D. A Zn/Cd/Ni Metal–Organic Framework-Based Solid and Flexible Fluoroprobes for Highly Selective Detection of 4-Nitroaniline in Real Water Samples. J Fluoresc (2024). https://doi.org/10.1007/s10895-024-03698-6
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DOI: https://doi.org/10.1007/s10895-024-03698-6