Reversible Solid-State Isomerism of Azobenzene-Loaded Large-Pore Isoreticular Mg-CUK-1
- Junpeng HeJunpeng HeDepartment of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Junpeng He
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- Kanchan AggarwalKanchan AggarwalDepartment of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Kanchan Aggarwal
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- Naman KatyalNaman KatyalDepartment of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Naman Katyal
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- Shichao HeShichao HeDepartment of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Shichao He
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- Edward ChiangEdward ChiangDepartment of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Edward Chiang
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- Samuel G. DunningSamuel G. DunningDepartment of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Samuel G. Dunning
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- Joseph E. Reynolds IIIJoseph E. Reynolds, IIIDepartment of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Joseph E. Reynolds, III
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- Alexander SteinerAlexander SteinerDepartment of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K.More by Alexander Steiner
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- Graeme Henkelman*Graeme Henkelman*[email protected]Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Graeme Henkelman
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- Emily L. Que*Emily L. Que*[email protected]Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Emily L. Que
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- Simon M. Humphrey*Simon M. Humphrey*[email protected]Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United StatesMore by Simon M. Humphrey
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 m2 g–1 and shows stark selectivity for CO2 sorption over N2, O2, H2, and CH4. It displays reversible, multistep gated sorption of CO2 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. trans-Azobenzene fills the channels in a 2 × 2 arrangement. Solid-state UV–vis spectroscopy reveals that azobenzene molecules undergo reversible trans–cis isomerization, despite being close-packed; this surprising result is confirmed by DFT-simulated UV–vis spectra.
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