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Title: Cyclodextrin-functionalized thiophene-based copolymers and their guest-host recognition behaviour
Authors: Soheila Bahmanjah.
Keywords: DRNTU::Engineering::Materials::Organic/Polymer electronics
Issue Date: 2008
Abstract: To construct super-molecular systems which recognize the structure of guest molecules, 3-bromo-alkylthiophene monomers bearing side chains (n = 6 & 8) have been polymerized into corresponding copolymers using the GRIM method. These copolymers are quantitatively and rapidly converted into functionalized polymers under mild conditions by post polymerization reactions with 6^A-amino-6^A-alpha-deoxy-cyclodextrin and 6^A-amino-6^A-beta-deoxy-cyclodextrin.These polythiophene derivatives exhibit a highly conjugated form in the solid state at room temperature and their molecular recognition behaviour has been investigated. Cyclic voltammetry shows strong affinity and selectivity of these polymers for a wide range of organic guests such as 3, 4-dihydroxyphenylalanine (DOPA), 1, 4-Dihydroxybenzene, 1, 4-Dihydroxynaphthalene, (S/R) Camphor, (S/R) Carvone, (S/R) Menthol and (S/R) Mandelic acid. Presence of these molecules in electrolytic media displayed a dramatic influence over the electrochemical properties of these polythiophene derivatives. An advantage of this design is that the sensory mechanism functions via reversible molecular recognition events, thereby allowing a completely reversible response such that in the absence of analyte, the sensory material returns back into its original unperturbed state. Details of polymer synthesis and the electrochemical behaviour are discussed.
Fulltext Permission: restricted
Fulltext Availability: With Fulltext
Appears in Collections:MSE Theses

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