Prabhu Viswanathan and Chandra Sureshkumar (2025) Pyrene carbaldehyde Schiff base as multifunctional chemosensors for environmental thorium determination and its real-time applications. Pyrene carbaldehyde Schiff base as multifunctional chemosensors for environmental thorium determination and its real-time applications, 1348 (2). pp. 1-9. ISSN 0022-2860

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Abstract

Thorium (Th4+) sensing is critical to nuclear fuel cycle monitoring and safeguards since it may become a fissile
material after neutron irradiation. Detection and assessment of Th4+ ions contamination is also crucial for
environmental monitoring. Herein, a new pyrene-based fluorescent probe was developed by incorporating an 8-
hydroxyquinoline moiety into the pyrene fluorophore (HQ-PY), which is used for Th4+ ions detection via fluorescent
quenching in semi-aqueous media. An on-off monomer-excimer conversion of HQ-PY was achieved
through the formation of a 2:1 coordination complex and fluorescent quenching at 520 nm. The HQ-PY exhibited
excellent selectivity, high sensitivity (LOD = 1.8 nM), and rapid response (55 s) to Th4+ ions. HQ-PY binding to
Th4+ ions was investigated by 1H NMR, FTIR, and ESI-Mass analysis, with the experimental data further supplemented
by density functional theory-based computational calculations. Furthermore, we extended this probe
performance in real water samples and monazite sand samples to monitor and quantify the pollution caused by
Th4+ ions.

Item Type: Article
Uncontrolled Keywords: Thorium Fluorescence Pyrene 8-Hydroxyquinoline Carbohydrazide
Divisions: PSG College of Arts and Science > Department of Chemistry
Depositing User: Dr. B Sivakumar
Date Deposited: 31 Oct 2025 09:56
Last Modified: 31 Oct 2025 09:56
URI: https://ir.psgcas.ac.in/id/eprint/2492

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