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Intensive Chiroptical Properties of Chiral Polyfluorenes Associated with Fibril Formation
Eindhoven University of Technology, Netherlands.
Radboud University of Nijmegen, Netherlands.
Linköping University, Department of Physics, Chemistry and Biology, Chemical and Optical Sensor Systems. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7104-7127
Radboud University of Nijmegen, Netherlands.
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2009 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 113, no 43, 14047-14051 p.Article in journal (Refereed) Published
Abstract [en]

Thin films of chiral poly {9,9-bis[(3S)-3,7-dimethyloctyl]-2,7-fluorene} (1) were studied using circular dichroism (CD) spectroscopy. Films spin coated from chloroform solution, show CD with a degree of polarization g(abs) (= +4 x 10(-4) at 400 nm) that is independent of film thickness (50-290 nm). This implies that gabs is an intensive property of the material and related to the chiral organization of the molecules on a length scale less than 50 nm. Atomic force microscopy (AFM) on the films reveals fibrils. Addition of nonsolvent methanol to a solution of 1 in chloroform leads to fibril formation in solution and results in CD similar in band shape to that of the pristine spin coated films from chloroform solution and a g(abs) comparable in magnitude. Thus the chiral molecular arrangement leading to circular dichroism is part of the internal structure of these fibrils.

Place, publisher, year, edition, pages
American Chemical Society , 2009. Vol. 113, no 43, 14047-14051 p.
National Category
Physical Sciences
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URN: urn:nbn:se:liu:diva-118180DOI: 10.1021/jp903083xISI: 000270911100002PubMedID: 19807137OAI: oai:DiVA.org:liu-118180DiVA: diva2:813517
Note

Funding Agencies|Netherlands Organization for Scientific Research (NWO) through a grant in the VIDI scheme

Available from: 2015-05-22 Created: 2015-05-22 Last updated: 2015-06-01

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Kemerink, Martijn
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Chemical and Optical Sensor SystemsThe Institute of Technology
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