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Shen, Boyuan; Chen, Xiao; Wang, Huiqiu; Xiong, Hao; Bosch, Eric G T; Lazić, Ivan; Cai, Dali; Qian, Weizhong; Jin, Shifeng; Liu, Xin; Han, Yu; Wei, Fei
Nature (London), 04/2021, Letnik: 592, Številka: 7855Journal Article
Single-molecule imaging is challenging but highly beneficial for investigating intermolecular interactions at the molecular level . Van der Waals interactions at the sub-nanometre scale strongly influence various molecular behaviours under confinement conditions . Inspired by the traditional compass , here we use a para-xylene molecule as a rotating pointer to detect the host-guest van der Waals interactions in the straight channel of the MFI-type zeolite framework. We use integrated differential phase contrast scanning transmission electron microscopy to achieve real-space imaging of a single para-xylene molecule in each channel. A good correlation between the orientation of the single-molecule pointer and the atomic structure of the channel is established by combining the results of calculations and imaging studies. The orientations of para-xylene help us to identify changes in the van der Waals interactions, which are related to the channel geometry in both spatial and temporal dimensions. This work not only provides a visible and sensitive means to investigate host-guest van der Waals interactions in porous materials at the molecular level, but also encourages the further study of other single-molecule behaviours using electron microscopy techniques.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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