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Visualizing Solid-State Molecular Motion by a Common Structural Determination Technique

preprint
submitted on 25.09.2019 and posted on 27.09.2019 by Jun Zhang, Haoke Zhang, Junkai Liu, Jacky W. Y. Lam, Ben Zhong Tang
Solid-state molecular motion plays a vital role in many advanced technologies. However, visualization of these processes is still challenging due to the limitation of characterization method. In this work, a common structural determination technique, single-crystal X-ray diffraction, is applied to “see” the static and dynamic molecular motions in tetraphenylethylene (TPE) which exhibits aggregation-induce emission (AIE) effect. Five kinds of motions, stretching, torsion, twisting, rocking, and wagging are observed and analyzed. As the static molecular motions, the middle double bond in TPE becomes short and twisted and the peripheral phenyl rings as a whole tend to be more twisted with the raising of testing temperature (150 to 298 K). Meanwhile, dynamic motions of phenyl-rings rocking and wagging are found to be more and more vigorous along with the increase of temperature. This work provides a platform for visualizing solid-state molecular motion based on a common technique. It also affords direct evidence for the AIE mechanism of restriction of intramolecular motions.

History

Email Address of Submitting Author

hzhangaz@connect.ust.hk

Institution

Hong Kong University of Science and Technology

Country

China

ORCID For Submitting Author

0000-0001-7309-2506

Declaration of Conflict of Interest

no conflict of interest

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