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. 2019 Apr 8;10:1612. doi: 10.1038/s41467-019-09486-2

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Solid-state characterization of SION-19 and SION-19′. a Final fit (Rietveld refinement) for a rigid-body structural refinement of the PXRD pattern of SION-19 (final observed: red circles, calculated: solid black lines, and difference: solid green line). b Solid-state ¹³C CP MAS NMR spectra of (top) SION-19 and (bottom) SION-19′ collected at 298 K. The assignment of the resonances in SION-19 is consistent with the expected resonances corresponding to the TBAPy and Ade ligands as well as to the DMF and [NH₂Me₂]⁺ molecules residing within the channels. c Type I N₂ isotherm measured on SION-19′ at 77 K and 1 bar (filled symbols: adsorption, empty: desorption)