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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. 1 — Structural representation of SION-19. a A Zn^II(adeninate) octahedron cage is coordinated to six Zn^II ions, four at the corners of the equatorial plane (Zn^II_eq) and two at the apical positions (Zn^II_ap). The Zn^II(adeninate) cages are linked to each other via the Zn^II_eq to form 1-dimensional columnar building blocks. b The Zn^II(adeninate) columnar building blocks are linked to each other via fully deprotonated TBAPy ligands—gray TBAPy is bound to Zn^II_ap whereas the lime green is bound to Zn^II_eq. c, d Connolly surface representation of SION-19 viewed along the a-axis, revealing that the coordination of TBAPy ligands to the Zn^II(adeninate) columns leads in the formation a 3-dimensional structure possessing two distinct types of 1-dimensional pores: the base-pore (blue) and the acid-pore (red). Highlighted in (d) are the Watson–Crick faces of Ade which point into the base pore and e Connolly surface representation of SION-19 in a 3-dimensional view. Atom color code: pink, Zn; red, O; blue, N; gray, C; light yellow, H