Chemosensor material as a metal–organic framework with potassium-based perylene tetracarboxylic acid for copper and lead detection

• Published in: Journal of molecular liquids Vol. 408; p. 125376
• Main Authors: Rajamohan, Rajaram, Ruby Raj, Michael, Selvamani, Thangavel, Murali Krishnan, Mani, Govindasamy, Chandramohan, Murugan, Moorthiraman, Rok Lee, Yong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.08.2024
• Subjects: Chemosensor; Heavy metal detection; Natural Bonding orbital analysis; Perylene-based metal–organic frameworks; Perylene-based metal–organic frameworks; Chemosensor; Natural Bonding orbital analysis; Heavy metal detection
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2024.125376

[Display omitted] •MOFs based on perylene with potassium material function as an efficient detection probe.•Only two distinct types of H signals from K4PTC, with no noticeable H signals from residual K4PTC evident by NMR.•The probe displayed diminished absorbance and fluorescence intensity upon the introduction of Cu2+ and Pb2+.•The binding ratio of K4PTC with metal ions is determined to be 1:2 by Job plot and Benesi–Hildebrand plots.•NBO reveals that the interaction between oxygen and potassium weakens significantly during metal addition to K4PTC. Heavy metal ions stand out as highly toxic pollutants, playing a pivotal role in various human diseases. Consequently, the development of advanced detection methods becomes imperative for global public health. A proven and effective strategy for metal ion detection involves the use of fluorescent chemosensors. In this context, we synthesized metal–organic frameworks (MOFs) based on perylene to create potassium-based MOFs functioning as an efficient detection probe for metal ion detection. Proton nuclear magnetic resonance (NMR) spectral analysis revealed only two distinct types of hydrogen signals are observed from K4PTC, and no hydrogen signals originating from any residual K4PTC are detected. Similarly, In the 13C NMR spectra, the most downfield signal observed at 176.9 ppm is conveniently assigned to the carbonyl carbon of the K4PTC. The probe displayed diminished absorbance and fluorescence intensity upon the introduction of Cu2+ and Pb2+, suggesting K4PTC’s potential as a sensor for detecting these metal ions. The above findings indicate that loading metal ions into the K4PTC system weakens the oxygen-potassium interaction, signifying the interaction between the metal ions and our probe. Interestingly, the limit of detection (LOD) for our sensor material is highly effective for detecting these metal ions. Consequently, this research serves as a significant reference for the sensitive monitoring of metal pollutants in the environment.