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Electropolymerisation dynamics of a highly conducting metallopolymer: poly-[Os(4-(5-(2,2-bithienyl))-2,2:6,2-terpyridine)2]2+
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry I.
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2004 (English)In: Electrochemistry communications, ISSN 1388-2481, E-ISSN 1873-1902, Vol. 6, no 2, 193-200 p.Article in journal (Other academic) Published
Abstract [en]

The potential, time, and concentration dependence of the potentiostatic electropolymerisation of the thienyl-substituted transition metal complex [Os(bttpy)22+] onto platinum disk microelectrodes is reported, bttpy is 4-(5-(2,2-bithienyl))-2,2:6,2-terpyridine. Oxidative electropolymerisation of the thienyl bridges is highly efficient with an electropolymerisation efficiency of 36 ± 3% being observed across a wide range of potentials and monomer concentrations. The osmium centres are oxidised when polymerisation proceeds and the deposited polymer is highly conducting allowing high surface coverage films, up to 6 × 10−7 mol cm−2, to be deposited within 60 s. SEM imaging reveals that smooth films can be produced using moderate overpotentials for electrodeposition. Significantly, diffusional mass transport controls the rate of film deposition allowing the radial diffusion field found at microelectrodes to be exploited to favour film growth co-planar with the electrode surface. The electropolymerisation rate increases approximately linearly with increasing monomer concentration from approximately 8 to 400 μM and this first-order dependence likely arises from mass transport limitations. The rate of homogeneous charge transport through potentiostatically deposited films, characterised by D1/2C, where D is the apparent charge transport diffusion coefficient and C is the concentration of osmium centres, is 3.5 ± 0.5 × 10−7 mol cm−2 s−1/2 and is largely insensitive to the deposition potential, and is very similar to that previously observed for potentiodynamically deposited films. This charge transport parameter is approximately two orders of magnitude larger than those found for non-conjugated bridges and is interpreted in terms of resonant superexchange across the quaterthienyl bridge.

Place, publisher, year, edition, pages
2004. Vol. 6, no 2, 193-200 p.
Keyword [en]
Electropolymerisation, Conducting polymer, Microelectrode, Charge transport, Redox conduction
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:uu:diva-48099DOI: 10.1016/j.elecom.2003.11.011OAI: oai:DiVA.org:uu-48099DiVA: diva2:76006
Available from: 2005-05-23 Created: 2005-05-23 Last updated: 2017-12-05Bibliographically approved

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Hagfeldt, Anders

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