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Added alkane allows thermal thinning of supramolecular columns by forming superlattice - an X-ray and neutron study

Yen, Ming Huei; Chaiprapa, Jitrin; Zeng, Xiangbing; Liu, Yongsong; Cseh, Liliana; Mehl, Georg H.; Ungar, Goran

Authors

Ming Huei Yen

Jitrin Chaiprapa

Xiangbing Zeng

Yongsong Liu

Liliana Cseh

Goran Ungar



Abstract

We report a columnar superlattice formed by blends of dendron-like Li 3,4,5-tris(n-alkoxy)benzoates with n-alkanes. Without the alkane, the wedge-shaped molecules form liquid crystal columns with 3 dendrons in a supramolecular disk. The same structure exists in the blend, but on heating one dendron is expelled from the disks in every third column and is replaced by the alkane. This superlattice of unequal columns is confirmed by complementary X-ray and neutron diffraction studies. Lateral thermal expansion of dendrons normally leads to the expulsion of excess molecules from the column, reducing the column diameter. However in the already narrow columns of pure Li salt, expulsion of one of only three dendrons in a disk is not viable. The added alkane facilitates the expulsion, as it replaces the missing dendron. Replacing the alkane with a functional compound can potentially lead to active nanoarrays with relatively large periodicity by using only small molecules.

Citation

Yen, M. H., Chaiprapa, J., Zeng, X., Liu, Y., Cseh, L., Mehl, G. H., & Ungar, G. (2016). Added alkane allows thermal thinning of supramolecular columns by forming superlattice - an X-ray and neutron study. Journal of the American Chemical Society, 138(18), 5757-5760. https://doi.org/10.1021/jacs.6b01172

Acceptance Date Apr 22, 2016
Online Publication Date Apr 27, 2016
Publication Date May 11, 2016
Deposit Date Apr 26, 2016
Publicly Available Date Apr 27, 2016
Journal Journal of the American Chemical Society
Print ISSN 0002-7863
Electronic ISSN 1520-5126
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 138
Issue 18
Pages 5757-5760
DOI https://doi.org/10.1021/jacs.6b01172
Keywords Alkane, Thermal thinning
Public URL https://hull-repository.worktribe.com/output/436963
Publisher URL http://pubs.acs.org/doi/abs/10.1021/jacs.6b01172
Copyright Statement © 2016 University of Hull
Additional Information This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/jacs.6b01172

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Copyright Statement
© 2016 University of Hull




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