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. 2021 Feb 9;11:3419. doi: 10.1038/s41598-021-83048-9

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© The Author(s) 2021

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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(a) Space–time yield of the reaction (STY) calculated for U20-NACP-3.75x, U20-NACP-2.5x, U20-NACP-2 × and U20-NACP. Data are expressed as mean (n = 3) with the corresponding standard error shown as error bars. (b) XRPD patterns of the hybrid materials. The characteristic reflections of urea, falling at 2θ = 22.4°, 24.6° and 29.3°, can be appreciated for the materials obtained by increasing the concentration of reagents 2.5 x, or higher than in the preparation of U20-NACP.