article · Applied Organometallic Chemistry
A new hybrid organic-inorganic nanoporous material designated as SBA-Pr-Is-Hy has been synthesised to serve as a fluorescence chemosensor for mercury ions. The synthesis involved modifying SBA-15 with (3-chloropropyl)triethoxysilane to produce SBA-Pr-Cl, which was subsequently reacted with isatin hydrazone. Comprehensive physical and structural characterisation confirmed the properties of the material using infrared spectroscopy, thermogravimetric analysis, electron microscopy, energy-dispersive X-ray analysis, X-ray diffraction, and surface area measurements. Fluorescence testing established that the material selectively detects mercury ions in the presence of other competing metal cations, achieving a detection limit of 3.5 × 10^-7 M. Density functional theory calculations, including molecular electrostatic potential and orbital analyses, verified the molecular geometry and validated the experimental interaction mechanism between the ligand and mercury ions.
Mercury ions are toxic and dangerous environmental contaminants that threaten human health and ecosystems. Identifying these pollutants requires simple, reliable, and highly sensitive detection methods. By demonstrating a nanoporous material that selectively signals the presence of mercury even when other metal cations are present, this research supports the development of targeted chemical tools for monitoring dangerous heavy metal contamination.
This sensing material could enable specialised monitoring systems for detecting toxic mercury contamination in water supplies and industrial effluents. Intended users would likely include environmental monitoring agencies, water testing laboratories, and industrial waste management teams. Because the work is limited to laboratory synthesis, optical evaluation, and computational modelling, it represents early-stage research that requires real-world sample validation and device engineering before commercial deployment.
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ABSTRACT In this study, a new hybrid organic–inorganic nanoporous material of SBA‐Pr‐Is‐Hy was synthesized by modification of SBA‐15 with (3‐chloropropyl)triethoxysilane to get SBA‐Pr‐Cl, which was reacted with isatin hydrazone to obtain SBA‐Pr‐Is‐Hy. This new compound was characterized by different FT‐IR, TGA, SEM, EDX, XRD, and BET techniques. Fluorescence spectroscopy of SBA‐Pr‐Is‐Hy was studied. According to the results, it can detect the Hg 2+ ion with a detection limit of 3.5 × 10 −7 M among the other metal cations. Hg 2+ ion is toxic and dangerous; it is very important to identify it with simple and efficient methods. DFT calculations, including molecular electrostatic potential (MEP) surface, geometry optimization, HOMO–LUMO analysis, and quantum chemical descriptors, were investigated utilizing the B3LYP/6‐311G(d,p)/LANL2DZ method. The DFT calculation verifies the experimental mechanism of interaction between the ligand and Hg 2+ .
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DOI: 10.1002/aoc.7818
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