Chromene Carbohydrazide- Schiff Base as a Highly Selective Turn-Off Fluorescence Chemosensor for In 3+ Ion and its Application.

Autor: Jayapriya S; Post-Graduate and Research Department of Chemistry, Chikkanna Government Arts College, Tiruppur, 641 602, Tamil Nadu, India.; Department of Chemistry, Sri Shakthi Institute of Engineering and Technology, Coimbatore, 641 062, Tamil Nadu, India., Ebenazer AF; Post-Graduate and Research Department of Chemistry, Chikkanna Government Arts College, Tiruppur, 641 602, Tamil Nadu, India., Sampathkumar N; Post-Graduate and Research Department of Chemistry, Chikkanna Government Arts College, Tiruppur, 641 602, Tamil Nadu, India., Rajesh J; Department of Chemistry, Saveetha School of Engineering, Institute of Medical and Technical Science, Saveetha University, Chennai, 602 105, Tamil Nadu, India., Rajagopal G; Post-Graduate and Research Department of Chemistry, Government Arts College (Autonomous), Coimbatore, 641 018, Tamil Nadu, India. rajagopal18@yahoo.com.
Jazyk: angličtina
Zdroj: Journal of fluorescence [J Fluoresc] 2024 Mar 09. Date of Electronic Publication: 2024 Mar 09.
DOI: 10.1007/s10895-024-03655-3
Abstrakt: A new 7-(diethylamino)-2-oxo-2 H-chromene-3-carbohydrazide design to synthesize a simple Schiff-base condition. The synthesized molecules' (probe L) photophysical properties were investigated in various solvent systems and solvent-poor-solvent assays. Probe L exhibits the absorbance band at 440 nm and the emission band at 488 nm in DMSO: H 2 O (7:3, v/v). Further, probe L shows selective turn-off emission recognition of In 3+ ions in DMSO: H 2 O (7:3, pH = 7.4). By Job's plot and ESI mass analysis, probe L forms a 1:2 stoichiometry complex with an estimated association constant of 4.04 × 10 4 M - 2 with In 3+ ions. Metal induces CHEQ (chelation-caused fluorescence quenching) to reduce the intensity of probe L's emission, and the estimated quenching constant was 4.52 × 10 4 M - 1 . The limit of detection was found to be 5.93 nM; the time response of the sensor is instantaneous, and its reversible nature was confirmed using EDTA additions. Solid substrates (test strips) were designed and tested for fast, reliable, user-friendly, and real-time sensing of In 3+ ions for on-site applications. The binding mechanism of probe L with In 3+ ions was investigated using 1 H NMR titration and DFT/TD-DFT studies.
(© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)
Databáze: MEDLINE
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