Controlling the photoluminescence of water‐soluble conjugated poly[2‐(3‐thienyl)ethyloxy‐4‐butylsulfonate)] for biosensor applications |
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| Authors: | Enrique López‐Cabarcos Jorge Rubio Retama Veronica Sholin Sue Ann Carter |
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| Affiliation: | 1. Department of Fisico‐Quimica Farmaceutica, University Complutense Madrid, 28040 Madrid, SpainDepartment of Fisico‐Quimica Farmaceutica, University Complutense Madrid, 28040 Madrid, Spain;2. Department of Fisico‐Quimica Farmaceutica, University Complutense Madrid, 28040 Madrid, Spain;3. Physics Department, University of California Santa Cruz, California 95064, USA |
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| Abstract: | The photoluminescence of poly2‐(3‐thienyl)ethyloxy‐4‐butylsulfonate)] (PTE‐BS) in aqueous solution increases threefold on addition of the surfactant tetrabutylammonium perchlorate (TBA). Furthermore, the luminescence of the PTE‐BS/TBA system is reduced by more than five times by the addition of small amounts of the cationic electron acceptor methyl viologen (MV2+). The Stern–Volmer constant KSV = 1.4 × 104 L mol?1 for the quenching of the polymer–surfactant complex by MV2+ is approximately 60 times smaller than the KSV = 8.4 × 105 L mol?1 obtained in water polymer solutions without surfactant. Thus, the luminescence of PTE‐BS in aqueous solution can be modulated by complexing the polymer either with a surfactant or with a quencher. In this contribution we show that the surfactant/quencher tuning effect found in polymers of the phenylenevinylene family, such as poly(2,5‐methoxy‐propyloxysulfonate phenylenevinylene), also appears in polymers of the thiophene family such as PTE‐BS. Copyright © 2007 Society of Chemical Industry |
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| Keywords: | polythiophene conjugated polymers photoluminescence quenching of luminescence surfactochromic effect |
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