Scholarlink

<p>This study reports the design of g-C<sub>3</sub>N<sub>4</sub>-based polymeric chemosensors functionalized with Schiff base derivatives formed by condensing g-C<sub>3</sub>N<sub>4</sub> 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 Zn<sup>2+</sup>, Cu<sup>2+</sup>, Co<sup>2+</sup>, and Ni<sup>2+</sup> ions. Notably, g-Ald-B displayed the highest affinity for Zn<sup>2+</sup> (K<sub>a</sub> ≈ 6.2 × 10<sup>4</sup>&#xa0;M<sup>-1</sup>) and the lowest detection limit (0.06&#xa0;µM), demonstrating its high sensitivity. These results highlight the potential of structurally tuned Schiff base-modified g-C<sub>3</sub>N<sub>4</sub> as versatile and efficient multi-ion sensors.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

From Structure to Signal: Optical Tuning of New g-C3N4 Schiff Bases for Metal Ion Sensing

  • 期刊论文

  • 发表日期：

    2025年8月26日

查看全文
  • Kaouther Abbassi,
  • Soumaya Agren,
  • Jamal El Haskouri,
  • Emmanuel Beyou,
  • Mohamed Hassen V Baouab

摘要

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.