Detection of aqueous and gaseous hydrogen sulfide with lanthanide–macrocycle binary complexes

P Mini, SE Walker, MR Grace, GH Dennison… - Dalton …, 2023 - pubs.rsc.org
P Mini, SE Walker, MR Grace, GH Dennison, KL Tuck
Dalton Transactions, 2023pubs.rsc.org
Two novel, discrete lanthanide–macrocycle binary complexes for the detection of hydrogen
sulfide are reported. The hydrogen sulfide sensing mechanism utilises the copper
sequestration at a secondary binding site, with resulting bimetallic lanthanide (III)/copper (II)
complexes (Ln= Eu3+ and Tb3+) exhibiting high selectivity, good sensitivity and excellent
reversibility for aqueous hydrogen sulfide. The inclusion of the DO2A macrocycle and 4-(2-
pyridyl)-1, 2, 3-triazole dipicolinic acid ligand, results in a complex with good solubility and …
Two novel, discrete lanthanide–macrocycle binary complexes for the detection of hydrogen sulfide are reported. The hydrogen sulfide sensing mechanism utilises the copper sequestration at a secondary binding site, with resulting bimetallic lanthanide(III)/copper(II) complexes (Ln = Eu3+ and Tb3+) exhibiting high selectivity, good sensitivity and excellent reversibility for aqueous hydrogen sulfide. The inclusion of the DO2A macrocycle and 4-(2-pyridyl)-1,2,3-triazole dipicolinic acid ligand, results in a complex with good solubility and stability. The europium(III) complex also displayed a low limit of detection (665 ppb) with a response time of 30 seconds with gaseous hydrogen sulfide. The improved water solubility and stability over a previous complex results in these sensors having the potential for use in environmental monitoring and biological studies for various functional settings.
The Royal Society of Chemistry
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