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Intensive Chiroptical Properties of Chiral Polyfluorenes Associated with Fibril Formation
Eindhoven University of Technology, Netherlands.
Radboud University of Nijmegen, Netherlands.
Eindhoven University of Technology, Netherlands.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, p. 14047-14051Article 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, p. 14047-14051
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-141483DOI: 10.1021/jp903083xISI: 000270911100002PubMedID: 19807137OAI: oai:DiVA.org:liu-141483DiVA: diva2:1145689
Note

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

Available from: 2017-09-29 Created: 2017-09-29 Last updated: 2017-10-06

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