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Title: A water-soluble bithiophene with increased photoluminescence efficiency and metal recognition ability
Authors: Delgado-Pinar, Estefanía 
Pineiro, Marta 
Melo, J. Sérgio Seixas de 
Issue Date: 15-Sep-2020
Publisher: Royal Society of Chemistry
Project: 02/SAICT/2017 
Serial title, monograph or event: Dalton Transactions
Volume: 49
Issue: 35
Abstract: A new water-soluble tri-tert-butyl-bithiophenesulfonamide (α2-tbS) was synthesized and a comprehensive spectroscopic and photophysical study was undertaken in organic solvents and water at different pH values. In contrast to the behaviour found for the parent (and un-substituted) α,α'-bithiophene (α2), in which radiationless decay processes are the main excited-state deactivation channels, the tert-butylsulfonamide derivative presents a significant fluorescence quantum yield (φF) (ca. one order of magnitude higher than that of α2). The high φF allowed further exploring α2-tbS as a selective fluorimetric sensor for metal ions. A strong selectivity towards Cu(ii) is observed at neutral pH values, whereas at pH = 9.5 a strong quenching upon the addition of Hg(ii) is observed. An additional high sensitivity of 0.64 ± 0.02 ppm towards Cu(ii) was observed, well below 1.25 ppm (∼20 μM), the maximum value allowed in drinking water by the EPA.
ISSN: 1477-9234
DOI: 10.1039/d0dt01385d
Rights: embargoedAccess
Appears in Collections:I&D CQC - Artigos em Revistas Internacionais

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