Ultra-Fast Molecular Rotors within Porous Organic Cages



Hughes, Ashlea R ORCID: 0000-0001-9625-6921, Brownbill, Nick J, Lalek, Rachel C, Briggs, Michael E ORCID: 0000-0003-1474-1267, Slater, Anna G ORCID: 0000-0002-1435-4331, Cooper, Andrew I ORCID: 0000-0003-0201-1021 and Blanc, Frederic ORCID: 0000-0001-9171-1454
(2017) Ultra-Fast Molecular Rotors within Porous Organic Cages. CHEMISTRY-A EUROPEAN JOURNAL, 23 (68). pp. 17217-17221.

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Abstract

Using variable temperature <sup>2</sup> H static NMR spectra and <sup>13</sup> C spin-lattice relaxation times (T<sub>1</sub> ), we show that two different porous organic cages with tubular architectures are ultra-fast molecular rotors. The central para-phenylene rings that frame the "windows" to the cage voids display very rapid rotational rates of the order of 1.2-8×10<sup>6</sup>  Hz at 230 K with low activation energy barriers in the 12-18 kJ mol<sup>-1</sup> range. These cages act as hosts to iodine guest molecules, which dramatically slows down the rotational rates of the phenylene groups (5-10×10<sup>4</sup>  Hz at 230 K), demonstrating potential use in applications that require molecular capture and release.

Item Type: Article
Uncontrolled Keywords: molecular rotors, NMR spectroscopy, porous organic cages, responsive materials, supramolecular chemistry
Depositing User: Symplectic Admin
Date Deposited: 09 Mar 2020 11:18
Last Modified: 19 Jan 2023 00:09
DOI: 10.1002/chem.201704964
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3070844

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