Dipicolylamine-Based Fluorescent Probes and Their Potential for the Quantification of Fe³⁺ in Aqueous Solutions.

ABSTRACT: We have synthesized two ligand systems, N(SO₂)(R₁)dpa (L1) and N(SO₂)(R₂)dpa (L2), where R₁ = biphenyl and R₂ = azobenzene, which are sulfonamide derivatives of the NNN-donor chelating dipicolylamine. Both L1 and L2 can be used as sensors for detecting Fe³⁺ 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)(H₂O)₃]³⁺ model complex involve -R₂-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, where

SUBMITTER: Vitharana NN 

PROVIDER: S-EPMC9386695 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature