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Intensive Chiroptic...
Intensive Chiroptical Properties of Chiral Polyfluorenes Associated with Fibril Formation
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- Lakhwani, Girish (författare)
- Eindhoven University of Technology, Netherlands
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- Gielen, Jeroen C. (författare)
- Radboud University of Nijmegen, Netherlands
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- Kemerink, Martijn (författare)
- Eindhoven University of Technology, Netherlands
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- Christianen, Peter C. M. (författare)
- Radboud University of Nijmegen, Netherlands
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- Janssen, Rene A. J. (författare)
- Eindhoven University of Technology, Netherlands
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- Meskers, Stefan C. J. (författare)
- Eindhoven University of Technology, Netherlands
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(creator_code:org_t)
- 2009-10-07
- 2009
- Engelska.
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Ingår i: Journal of Physical Chemistry B. - : American Chemical Society. - 1520-6106 .- 1520-5207. ; 113:43, s. 14047-14051
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Ämnesord
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
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