Excited state intramolecular proton transfer dual emission Schiff bases for metal detection and cell imaging

Joy, Francis; V, Aakash; Devasia, Jyothis; Nizam, Aatika

doi:10.1080/05704928.2023.2276925

Applied Spectroscopy Reviews

2023

DOI: 10.1080/05704928.2023.2276925

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Excited state intramolecular proton transfer dual emission Schiff bases for metal detection and cell imaging

Francis Joy,

Aakash V,

Jyothis Devasia

et al.

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Cited by 4 publications

References 92 publications

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3‐Ethoxysalicylaldimine‐based symmetrical azine‐linked luminogen exhibiting ESIPT and bright orange colour AIE behaviour with live cell bioimaging application

Mathivanan,

Shanmugaraj,

Ilanchelian

et al. 2024

Luminescence

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Herein, we describe the design and development of a new cell‐permeable aggregation‐induced emission (AIE) active 3‐ethoxysalicylaldimine‐based symmetrical azine molecule HDBE. The synthesized compound underwent comprehensive investigation of different spectroscopic methods, like NMR, mass and single crystal X‐ray diffraction analysis. The fluorophore HDBE exhibited the bright orange colour AIE behaviour in THF–H2O mixture. The drastic enhancement of emission was achieved upon adding the water to the THF solution of HDBE, with a concentration of 90%. Along with the dynamic light scattering (DLS) and quantum yield measurements, the formation of aggregates was also verified by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis. Further, HDBE demonstrated excited state intramolecular proton transfer (ESIPT) characteristics in different polarity of solvents, which was corroborated by absorption, emission and lifetime spectroscopical investigations. The detailed scrutiny of X‐ray structure of HDBE displayed the two strong intramolecular hydrogen bonding interactions, while solid‐state fluorescent spectra showed dual emission that corresponds to enol and keto form confirming the ESIPT feature. Further, the synthesized AIE molecule was non‐toxic and cell‐permeable, making it easy to label as a biomarker in live HeLa cells via fluorescent bioimaging. These studies offer a quick and easy way to develop both AIE and ESIPT‐coupled molecules for live cell bioimaging applications.

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3‐Ethoxysalicylaldimine‐based symmetrical azine‐linked luminogen exhibiting ESIPT and bright orange colour AIE behaviour with live cell bioimaging application

Mathivanan,

Shanmugaraj,

Ilanchelian

et al. 2024

Luminescence

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show abstract

Recent progress in ESIPT-based fluorescent chemosensors for detection of Zn2+, Mg2+ and Cu2+

Roohi

2025

Dyes and Pigments

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Coordination-driven molecular switch on the base of an ESIPT-capable pyrimidine ligand: Synthesis, fine-tuning of emission by the halide anion and theoretical studies

Shekhovtsov,

Nikolaenkova,

Vorobyeva

et al. 2025

Journal of Photochemistry and Photobiology A: Chemistry

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Excited state intramolecular proton transfer dual emission Schiff bases for metal detection and cell imaging

Cited by 4 publications

References 92 publications

3‐Ethoxysalicylaldimine‐based symmetrical azine‐linked luminogen exhibiting ESIPT and bright orange colour AIE behaviour with live cell bioimaging application

3‐Ethoxysalicylaldimine‐based symmetrical azine‐linked luminogen exhibiting ESIPT and bright orange colour AIE behaviour with live cell bioimaging application

Recent progress in ESIPT-based fluorescent chemosensors for detection of Zn2+, Mg2+ and Cu2+

Coordination-driven molecular switch on the base of an ESIPT-capable pyrimidine ligand: Synthesis, fine-tuning of emission by the halide anion and theoretical studies

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