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Cationic polyfluorene: conformation and aggregation in a "good" solvent
Umeå University, Faculty of Science and Technology, Physics. (Material och Nanofysik)
Natl Univ Singapore, Dept Chem & Biomol Engn.
Umeå University, Faculty of Science and Technology, Chemistry.
Umeå University, Faculty of Science and Technology, Chemistry.
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2009 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, ISSN 0014-3057, Vol. 45, no 11, 3228-3233 p.Article in journal (Refereed) Published
Abstract [en]

The conjugated polyelectrolyte (CPE) poly{9,9'-bis[6 ''-(N,N,N-trimethylammonium)-hexylfluorene-alt-co-phenylene] dibromide} (PFPN+Br-) demonstrates a high solubility in methanol in comparison to other more hydrophilic or hydrophobic solvents. We have employed a combination of pulsed-field-gradient-NMR, photoluminescence (PL), and Raman spectroscopy to establish the conformation and aggregation behavior of PFPN+Br- in methanol, with the aim to attain information on how to design CPEs with a high solubility in a preferred solvent. We find that the diffusion coefficient and PL spectrum of PFPN+Br-, as well as the Raman-active methyl rocking mode of methanol, all exhibit a strong dependence on PFPN+Br- concentration. We rationalize our findings with a model in which PFPN+Br- forms aggregates via ∏-∏ interactions between main-chain segments, while the ionic side chains are surrounded and electrostatically screened by the methanol solvent. Accordingly, the notably high solubility of PFPN+Br- in methanol is rationalized by favorable interactions between the ionic side chains and the methanol molecules. We propose that an appropriate design of a high-solubility CPE should consider a matching of the mixed hydrophobic/hydrophilic character of the ionic side chain with that of the preferred solvent.

Place, publisher, year, edition, pages
OXFORD, ENGLAND: PERGAMON-ELSEVIER SCIENCE LTD , 2009. Vol. 45, no 11, 3228-3233 p.
Keyword [en]
SOLUBLE CONJUGATED POLYMERS; EMITTING ELECTROCHEMICAL-CELL; DUAL ELECTROLUMINESCENCE; HIGH-EFFICIENCY; DNA DETECTION; LIGHT; POLYELECTROLYTES; FLUORESCENCE; DEVICES; SPECTROSCOPY
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:umu:diva-29762DOI: 10.1016/j.eurpolymj.2009.07.018OAI: oai:DiVA.org:umu-29762DiVA: diva2:277969
Available from: 2009-11-23 Created: 2009-11-23 Last updated: 2017-12-12

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Wågberg, ThomasOrädd, GregerEliasson, BertilEdman, Ludvig
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