Electrostatically Self-assembled Multilayers of Novel Symmetrical Rigid-Rod Polyanionic and Polycationic Polythiophenes on ITO/Glass and Gold Electrodes
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- 作者：Gianni Zotti ; Sandro Zecchin ; Gilberto Schiavon ; Barbara Vercelli ; Anna Berlin ; and William Porzio
- 刊名：Chemistry of Materials
- 出版年：2004
- 出版时间：June 1, 2004
- 年：2004
- 卷：16
- 期：11
- 页码：2091 - 2100
- 全文大小：533K
- 年卷期：v.16,no.11(June 1, 2004)
- ISSN：1520-5002
文摘
Anodic coupling of 4,4-bis-butanesulfonate cyclopentadithiophene occurs in acetonitrileafter the addition of 1:1 HClO4 to yield water-soluble polyanionic poly(1). 4,4-Bis-hexyltrimethylammonium cyclopentadithiophene is polymerized in acetonitrile to acetonitrile-solublepolycationic poly(2) which is converted to the water-soluble hydroxide form by anion exchange.These novel water-soluble polythiophenes, characterized by a rigid-rod symmetrical shapeof the chain, display a high conjugation length (
max = 560-575 nm) and a good solubilityin water (>10 gL-1). MALDI and UV-vis spectroscopy assign these polymers a degree ofpolymerization of 5-6. The polymers form stable monolayers (storing a redox charge of 10
C cm-2) on ITO/glass and gold electrodes. Subsequent electrostatic self-assembly (ESA) ofpoly(1) and poly(2), both between them and each with a non-electroactive polycation orpolyanion, proceeds with a linear growth rate monitored by cyclic voltammetry (10 C cm-2bilayer-1) and UV-vis spectroscopy. No effect of ionic strength was observed in contrastwith ESA of conventional polyionic polymers. IRRAS and XRD analysis of the multilayersagree with a regular disposition of the polythiophene chains in the layers.
max = 560-575 nm) and a good solubilityin water (>10 gL-1). MALDI and UV-vis spectroscopy assign these polymers a degree ofpolymerization of 5-6. The polymers form stable monolayers (storing a redox charge of 10C cm-2) on ITO/glass and gold electrodes. Subsequent electrostatic self-assembly (ESA) ofpoly(1) and poly(2), both between them and each with a non-electroactive polycation orpolyanion, proceeds with a linear growth rate monitored by cyclic voltammetry (10 C cm-2bilayer-1) and UV-vis spectroscopy. No effect of ionic strength was observed in contrastwith ESA of conventional polyionic polymers. IRRAS and XRD analysis of the multilayersagree with a regular disposition of the polythiophene chains in the layers.