Reversible Solid-State Isomerism of Azobenzene-Loaded Large-Pore Isoreticular Mg-CUK-1



He, Junpeng, Aggarwal, Kanchan, Katyal, Naman, He, Shichao, Chiang, Edward, Dunning, Samuel G, Reynolds, Joseph EIII, Steiner, Alexander ORCID: 0000-0002-4315-6123, Henkelman, Graeme, Que, Emily L
et al (show 1 more authors) (2020) Reversible Solid-State Isomerism of Azobenzene-Loaded Large-Pore Isoreticular Mg-CUK-1. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 142 (14). pp. 6467-6471.

[img] Text
jacs2020.pdf - Author Accepted Manuscript

Download (1MB) | Preview

Abstract

A large-pore version of Mg-CUK-1, a water-stable metal-organic framework (MOF) with 1-D channels, was synthesized in basic water. Mg-CUK-1L has a BET surface area of 2896 m<sup>2</sup> g<sup>-1</sup> and shows stark selectivity for CO<sub>2</sub> sorption over N<sub>2</sub>, O<sub>2</sub>, H<sub>2</sub>, and CH<sub>4</sub>. It displays reversible, multistep gated sorption of CO<sub>2</sub> below 0.33 atm. The dehydrated single-crystal structure of Mg-CUK-1L confirms retention of the open-channel structure. The MOF can be loaded with organic molecules by immersion in hot melts, providing single crystals suitable for X-ray diffraction. <i>trans</i>-Azobenzene fills the channels in a 2 × 2 arrangement. Solid-state UV-vis spectroscopy reveals that azobenzene molecules undergo reversible <i>trans</i>-<i>cis</i> isomerization, despite being close-packed; this surprising result is confirmed by DFT-simulated UV-vis spectra.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 01 Apr 2020 11:07
Last Modified: 18 Jan 2023 23:56
DOI: 10.1021/jacs.9b13793
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3081304