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X-ray birefringence imaging of materials with anisotropic molecular dynamics

Palmer, Benjamin A., Edwards-Gau, Gregory, Kariuki, Benson ORCID:, Harris, Kenneth David Mclean ORCID:, Dolbnya, Igor P., Collins, Stephen P. and Sutter, John P. 2015. X-ray birefringence imaging of materials with anisotropic molecular dynamics. The Journal of Physical Chemistry Letters 6 , pp. 561-567. 10.1021/jz502652n

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The X-ray birefringence imaging (XBI) technique, reported very recently, is a sensitive tool for spatially resolved mapping of the local orientational properties of anisotropic materials. In this paper, we report the first XBI measurements on materials that undergo anisotropic molecular dynamics. Using incident linearly polarized X-rays with energy close to the Br K-edge, the X-ray birefringence is dictated by the orientational properties of the C–Br bonds in the material. We focus on two materials (urea inclusion compounds containing 1,8-dibromooctane and 1,10-dibromodecane guest molecules) for which the reorientational dynamics of the brominated guest molecules (and hence the reorientational dynamics of the C–Br bonds) are already well characterized by other experimental techniques. The XBI results demonstrate clearly that, for the anisotropic molecular dynamics in these materials, the effective X-ray optic axis for the X-ray birefringence phenomenon is the time-averaged resultant of the orientational distribution of the C–Br bonds.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: X-ray Birefringence Imaging; Molecular Dynamics; Bond Orientations; Phase Transitions; Molecular Crystals
Publisher: ACS Publications
ISSN: 1948-7185
Last Modified: 27 Oct 2022 10:23

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