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Issue 16, 2019
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Origin of the isotropic motion in crystalline molecular rotors with carbazole stators

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Abstract

Herein we report two crystalline molecular rotors 1 and 4 that show extremely narrow signals in deuterium solid-state NMR spectroscopy. Although this line shape is typically associated with fast-moving molecular components, our VT 2H NMR experiments, along with X-ray diffraction analyses and periodic DFT computations show that this spectroscopic feature can also be originated from low-frequency intramolecular rotations of the central phenylene with a cone angle of 54.7° that is attained by the cooperative motion of the entire structure that distorts the molecular axis to rotation. In contrast, two isomeric structures (2 and 3) do not show a noticeable intramolecular rotation, because their crystallographic arrays showed very restricting close contacts. Our findings clearly indicate that the multiple components and phase transitions in crystalline molecular machines can work in concert to achieve the desired motion.

Graphical abstract: Origin of the isotropic motion in crystalline molecular rotors with carbazole stators

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Publication details

The article was received on 03 Oct 2018, accepted on 14 Mar 2019 and first published on 20 Mar 2019


Article type: Edge Article
DOI: 10.1039/C8SC04398A
Chem. Sci., 2019,10, 4422-4429
  • Open access: Creative Commons BY license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    Origin of the isotropic motion in crystalline molecular rotors with carbazole stators

    A. Colin-Molina, M. J. Jellen, E. García-Quezada, M. E. Cifuentes-Quintal, F. Murillo, J. Barroso, S. Pérez-Estrada, R. A. Toscano, G. Merino and B. Rodríguez-Molina, Chem. Sci., 2019, 10, 4422
    DOI: 10.1039/C8SC04398A

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