Intensive Chiroptical Properties of Chiral Polyfluorenes Associated with Fibril Formation

Lakhwani, Girish (författare): Eindhoven University of Technology, Netherlands

Kemerink, Martijn (författare): Eindhoven University of Technology, Netherlands

Christianen, Peter C. M. (författare): Radboud University of Nijmegen, Netherlands

Janssen, Rene A. J. (författare): Eindhoven University of Technology, Netherlands

Meskers, Stefan C. J. (författare): Eindhoven University of Technology, Netherlands

(creator_code:org_t)

2009-10-07
2009
Engelska.
Ingår i: Journal of Physical Chemistry B. - : American Chemical Society. - 1520-6106 .- 1520-5207. ; 113:43, s. 14047-14051

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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.

Av författaren/redakt...: Lakhwani, Girish; Gielen, Jeroen C ...; Kemerink, Martij ...; Christianen, Pet ...; Janssen, Rene A. ...; Meskers, Stefan ...

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