ArticleJournal of fluorescence2025
From Structure to Signal: Optical Tuning of New g-C3N4 Schiff Bases for Metal Ion Sensing.
Article in Journal of fluorescence, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
This study reports the design of g-C3N4-based polymeric chemosensors functionalized with Schiff base derivatives formed by condensing g-C3N4 with three structurally distinct aromatic aldehydes. The aim is to explore how aldehyde substituents and conjugation influence the structural, thermal, and optical properties of the resulting materials. FTIR confirmed imine linkage formation, while UV–Vis and fluorescence studies revealed solvent-dependent optical shifts and variable emission intensities. g-Ald-B (hydroxy-naphthalene) and g-Ald-C (pyrene) exhibited strong fluorescence, in contrast to the weakly emissive nitro-substituted g-Ald-A. All derivatives showed selective fluorogenic or colorimetric responses to Zn2+, Cu2+, Co2+, and Ni2+ ions. Notably, g-Ald-B displayed the highest affinity for Zn2+ (Ka ≈ 6.2 × 104 M-1) and the lowest detection limit (0.06 µM), demonstrating its high sensitivity. These results highlight the potential of structurally tuned Schiff base-modified g-C3N4 as versatile and efficient multi-ion sensors.
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