Journal
MATERIALS CHEMISTRY FRONTIERS
Volume 5, Issue 1, Pages 341-346Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0qm00754d
Keywords
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Funding
- National Natural Science Foundation of China [21788102, 21671003]
- Research Grants Council of Hong Kong [16308016, C6009-17G, A-HKUST 605/16]
- Innovation and Technology Commission [ITC-CNERC14SC01]
- Science and Technology Plan of Shenzhen [JCYJ20160229205601482, JCY20170818113602462]
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This study utilized variable-temperature XRD characterization to investigate the static conformational change and dynamic trajectory of tetraphenylethylene in the solid state, shedding light on the aggregation-induced emission effect. The analysis revealed five types of molecular motions and provided insights into the AIE mechanism.
Changes of molecular conformation in the solid state play a vital role in many advanced technologies. Single-crystal X-ray diffraction (XRD), serving as a common structural determination technique, has been widely used to perform structural analysis. In this work, variable-temperature XRD characterization has been utilized to see the static conformational change (SCC) and dynamic trajectory (DT) of tetraphenylethylene (TPE) in the solid state, which exhibits an aggregation-induced emission (AIE) effect. Five kinds of motions, stretching, torsion, twisting, rocking, and wagging, are observed and analyzed. In terms of the SCC, the middle double bond in TPE becomes short and twisted and the peripheral phenyl rings as a whole tend to be more twisted with increase of the testing temperature (150 to 298 K). For the DT, phenyl-ring rocking and wagging are found to be more and more vigorous along with the increase of temperature, which is closely related to the synchronously decreased luminescent intensity. This work affords direct structural evidence for the AIE mechanism of restriction of intramolecular motions and provides a new platform to investigate the photophysical processes.
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