Dipicolylamine-Based Fluorescent Probes and Their Potential for the Quantification of Fe in Aqueous Solutions

Overview

Journal ACS Omega

Publisher American Chemical Society

Specialty Chemistry

Date 2022 Aug 22

PMID 35990462

Authors

Nipuni N Vitharana

Chiranthi Kaushalya

Theshini Perera

Samitha P Deraniyagala

W M C Sameera

Asitha T Cooray

Affiliations

Soon will be listed here.

Abstract

We have synthesized two ligand systems, N(SO)(R)dpa (L1) and N(SO)(R)dpa (L2), where R = biphenyl and R = azobenzene, which are sulfonamide derivatives of the NNN-donor chelating dipicolylamine. Both L1 and L2 can be used as sensors for detecting Fe and are highly sensitive and selective over a wide range of common cations. Time-dependent density functional theory (TDDFT) calculations confirmed that the key excitations of L2 and the [Fe(L2)(HO)] model complex involve -R-unit-based π and π* charge transfer. L2 demonstrates a relatively high photostability, a fluorescence turn-on mechanism, and a detection limit of 0.018 μM with 1.00 μM L2 concentration, whereas L1 has a detection limit of 0.67 μM. Thus, both ligands have the potential to be used as fluorosensors for the detection of Fe in aqueous solutions.

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