CARBOXYLATED POLYTHIOPHENES: POLYMER BIOSENSORS IN LIQUID AND SOLID STATES*

Young-Gi Kim Department of Chemistry, University of Massachusetts—Lowell, Lowell, MA, 01854; Center for Advanced Materials, University of Massachusetts—Lowell, Lowell, MA, 01854, U.S.A.

Lynne A. Samuelson US Army Soldier and Biological Chemical Command, Natick Soldier Center, Natick, MA, 01760, U.S.A.

Jayant Kumar Department of Physics, University of Massachusetts—Lowell, Lowell, MA, 01854; Center for Advanced Materials, University of Massachusetts—Lowell, Lowell, MA, 01854, U.S.A.Correspondence[email protected]

Sukant K. Tripathy Department of Chemistry, University of Massachusetts—Lowell, Lowell, MA, 01854, U.S.A.; Center for Advanced Materials, University of Massachusetts—Lowell, Lowell, MA, 01854, U.S.A.

ABSTRACT

The fluorescence of carboxylated and water-soluble poly(3-thiophene acetic acid) (PTAA) and poly[2,5-(3-carboxymethyl urethanyl ethyl) thiophene] (H-PURET) are quenched by low concentrations of methyl viologen in aqueous solutions. The Stern-Volmer constants (K_sv) for these aqueous solutions of polythiophenes are in the order of 3.5×10⁶. However, in contrast, ionically adsorbed monolayers of these polythiophenes on solid supports show fluorescence quenching that is more than two orders of magnitude smaller. The effects of pH and the concentration of the methyl viologen on fluorescence quenching are reported.

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ACKNOWLEDGMENTS

Drs. Jaehyun Kim and Ravi Mosurkal are acknowledged for helpful discussions.

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CARBOXYLATED POLYTHIOPHENES: POLYMER BIOSENSORS IN LIQUID AND SOLID STATES*

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CARBOXYLATED POLYTHIOPHENES: POLYMER BIOSENSORS IN LIQUID AND SOLID STATES*

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