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Gate-opening induced by C8 aromatics in a double diamondoid coordination network

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Coordination networks (CNs) that undergo guest-induced structural transformations are of topical interest thanks to their potential utility in separations and storage applications. Herein, we report a double diamondoid (ddi) topology CN, [Ni2(bimpz)2(bdc)2(H2O)]n or X-ddi-2-Ni (H2bdc = 1,4-benzenedicarboxylic acid, bimpz = 3,6-bis(imidazol-1-yl)pyridazine), that undergoes structural transformations induced by C8 isomers, i.e., xylenes (o-xylene, OX; m-xylene, MX; p-xylene, PX) and ethylbenzene (EB). X-ddi-2-Ni was characterized by single-crystal to single-crystal transformations from a nonporous phase, X-ddi-2-Ni-β, to isostructural C8-loaded phases, namely X-ddi-2-Ni-OX, X-ddi-2-Ni-MX, X-ddi-2-Ni-PX and X-ddi-2-Ni-EB. X-ddi-2-Ni accommodates two C8 isomers per Ni unit, resulting in relatively high uptake (ca. 50 wt %), but with low selectivity toward C8 isomers as found using nuclear magnetic resonance (NMR) and gas chromatography (GC). In addition, a narrow range of gate-opening pressures for each isomer was determined from dynamic vapor sorption, consistent with the nonadaptable nature of the C8-loaded phase determined crystallographically, also supported by modeling.

Funding

SYNergistic SORBents

European Research Council

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Green Adsorbents for Clean Energy (GrACE)

Science Foundation Ireland

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History

Publication

ACS Materials Letters, 2024, 6, pp. 2197-2204

Publisher

American Chemical Society

Other Funding information

We gratefully acknowledge the Irish Research Council IRCLA/2019/167), the European Research Council (ADG 885695),and the Science Foundation Ireland (16/IA/4624). M.V.thanks the Irish Centre for High-End Computing (ICHEC) forthe provision of computational facilities.

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  • Bernal Institute

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  • Chemical Sciences

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