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<p>Introducing the new Quinoline-based Schiff base (<b>BB-SB</b>), crafted through a single-step condensation reaction between 5-aminoquinoline and 5-bromo-2-thiophene carboxaldehyde and meticulously characterized using a range of spectroscopic techniques. This synthesized compound showcases exceptional aggregation-induced enhanced emission (AIEE) properties, boasting a staggering 38-fold boost in fluorescence intensity and a 24&#xa0;nm redshift when tested in a 50:50 acetonitrile-water blend, compared to pure DMF. The impressive AIEE performance was further validated by dynamic light scattering (DLS) analysis. <b>BB-SB</b> displays its ability to selectively identify Fe<sup>2+</sup> and Hg<sup>2+</sup> ions amidst a sea of 16 heavy metals, employing spectrofluorometric techniques with remarkable sensitivity. The limits of detection (LOD) for Fe<sup>2+</sup> and Hg<sup>2+</sup> stand at 3.3&#xa0;μM and 1.3&#xa0;μM, respectively. Job’s plot analysis revealed a 1:2 ligand-to-metal binding stoichiometry for both ions. The quenching mechanism for mercury was delved into through Stern-Volmer plots, and was found to follow static quenching mechanism. Moreover, the aldehyde intermediate generated during the synthesis of <b>BB-SB</b> displayed intriguing solvatochromic behaviour, featuring donor and acceptor moieties. This feature highlights its potential as a candidate for color-tunable, solution-processable optoelectronic devices. While the present work focuses on sensing performance, the preliminary findings suggest that future exploration of the optoelectronic applications of these systems, including OLEDs, may be promising.</p> Graphical Abstract <p></p>

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Synthesis, Characterization, Theoretical Analysis, and Solvatochromic Evaluation of Aminoquinoline-Based AIEE-Active Schiff Base, along with its Application as a Probe for Hg2+ and Fe2+ Detection

  • 期刊论文

  • 发表日期：

    2026年2月19日

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  • Navjot Sandhu,
  • Nittish Sharma,
  • Jyoti Saini,
  • Vandana Saraswat,
  • Sahil Kohli

摘要

Introducing the new Quinoline-based Schiff base (BB-SB), crafted through a single-step condensation reaction between 5-aminoquinoline and 5-bromo-2-thiophene carboxaldehyde and meticulously characterized using a range of spectroscopic techniques. This synthesized compound showcases exceptional aggregation-induced enhanced emission (AIEE) properties, boasting a staggering 38-fold boost in fluorescence intensity and a 24 nm redshift when tested in a 50:50 acetonitrile-water blend, compared to pure DMF. The impressive AIEE performance was further validated by dynamic light scattering (DLS) analysis. BB-SB displays its ability to selectively identify Fe2+ and Hg2+ ions amidst a sea of 16 heavy metals, employing spectrofluorometric techniques with remarkable sensitivity. The limits of detection (LOD) for Fe2+ and Hg2+ stand at 3.3 μM and 1.3 μM, respectively. Job’s plot analysis revealed a 1:2 ligand-to-metal binding stoichiometry for both ions. The quenching mechanism for mercury was delved into through Stern-Volmer plots, and was found to follow static quenching mechanism. Moreover, the aldehyde intermediate generated during the synthesis of BB-SB displayed intriguing solvatochromic behaviour, featuring donor and acceptor moieties. This feature highlights its potential as a candidate for color-tunable, solution-processable optoelectronic devices. While the present work focuses on sensing performance, the preliminary findings suggest that future exploration of the optoelectronic applications of these systems, including OLEDs, may be promising.

Graphical Abstract