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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. 3 — Characterizations of Zr-PDI^•−. a TEA adsorption and desorption of activated Zr-PDI; inset shows TEA vapor in Zr-PDI channel. b ¹H NMR spectra of TEA-loaded Zr-PDI before (black line) and after (red line) irradiation; inset shows the peaks of PDI. c EPR spectra of solid Zr-PDI^•− and P-2COOH^•−; inset shows the magnified spectrum of P-2COOH^•−. d Stability of Zr-PDI^•− loaded with different amines under ambient conditions after a week. The ordinate represents the retention rates of the absorption peak at 1008 nm. TEA triethylamine, EDA ethylenediamine, TPA tripropylamine, DEA diethylamine, IPA isopropylamine, TMA trimethylamine