(a) Ligand possessing a low intrinsic rotation barrier. (b) Deviation from single-barrier Debye relaxation resulting from (c) interactions between rotator and framework in crystal environment.
Scientific Achievement
The non-Debye relaxation behavior of amphidynamic zirconium MOF is identified by broadband dielectric spectroscopy and a low barrier is found despite rotator-framework interactions.
Significance and Impact
The work provides an approach for analyzing complicated dynamics of dipolar rotor arrays in a porous framework and paves the way for future design of dielectric materials.
Research Details
- The dynamics of dipolar rotator arrays in amphidynamic MOF crystals are determined by broadband dielectric spectroscopy
- Analysis reveals fast rotational dynamics and low activation barrier of 2,3-difluorophenylene rotator linked by triple bonds
- Hydrogen-bonds between rotor and framework give rise to dynamic heterogeneity
Zhiyu Liu, Yangyang Wang, and M. A. Garcia-Garibay, "Rotational Dynamics of an Amphidynamic Zirconium Metal-Organic Framework Determined by Dielectric Spectroscopy," J. Phys. Chem. Lett. 12, 5644-5648 (2021). DOI: 10.1021/acs.jpclett.1c01333
