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. 2019 Feb 15;10:767. doi: 10.1038/s41467-019-08434-4

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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 — Synthesis of 3D porous Zr-PDI. a Structures of Zr-cluster and P-2COOH. b Connection mode of Zr-cluster (the Zr-cluster is fully coordinated by 12 carboxylate units) and molecular arrangement of chiral P-2COOH. c a-Axis crystal structure of Zr-PDI. d Single distorted adamantanoid cage (the distorted cage is similar to adamantane) in Zr-PDI. Hydrogen atoms have been omitted for clarity. e Results of stability tests of Zr-PDI incubated under various conditions for 24 h. Zr-PDI powder is washed with acetone and dried under vacuum at 120 °C prior to measurement. f N₂ sorption isotherm at 77 K and corresponding pore size distribution