AI Article Synopsis
- The X-ray birefringence imaging (XBI) technique is a new method that allows for detailed mapping of how materials with different orientations behave under certain conditions.
- This paper presents the first use of XBI on materials that show anisotropic molecular dynamics, specifically focusing on urea inclusion compounds with two different dibrominated guest molecules.
- The findings indicate that the effective optic axis of the X-ray birefringence is determined by the average orientation of the C-Br bonds over time, highlighting the relationship between molecular dynamics and X-ray behavior.
Article Abstract
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.
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| http://dx.doi.org/10.1021/jz502652n | DOI Listing |
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