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Instruments / Technical Area	Publication Details	Published	Actions
I19-Small Molecule Single Crystal Diffraction	Growth of single-crystal imine-linked covalent organic frameworks using amphiphilic amino-acid derivatives in water Zhipeng Zhou , Lei Zhang , Yonghang Yang , Inigo J. Vitórica-Yrezábal , Honglei Wang , Fanglin Tan , Li Gong , Yuyao Li , Pohua Chen , Xin Dong , Zihao Liang , Jing Yang , Chao Wang , Yuexian Hong , Yi Qiu , Armin Gölzhäuser , Xudong Chen , Haoyuan Qi , Sihai Yang , Wei Liu , Junliang Sun , Zhikun Zheng Nature Chemistry 355 DOI: 10.1038/s41557-023-01181-6 Diamond Proposal Number(s): [31627] Show Abstract ▼ Abstract: A core feature of covalent organic frameworks (COFs) is crystallinity, but current crystallization processes rely substantially on trial and error, chemical intuition and large-scale screening, which typically require harsh conditions and low levels of supersaturation, hampering the controlled synthesis of single-crystal COFs, particularly on large scales. Here we report a strategy to produce single-crystal imine-linked COFs in aqueous solutions under ambient conditions using amphiphilic amino-acid derivatives with long hydrophobic chains. We propose that these amphiphilic molecules self-assemble into micelles that serve as dynamic barriers to separate monomers in aqueous solution (nodes) and hydrophobic compartments of the micelles (linkers), thereby regulating the polymerization and crystallization processes. Disordered polyimines were obtained in the micelle, which were then converted into crystals in a step-by-step fashion. Five different three-dimensional COFs and a two-dimensional COF were obtained as single crystals on the gram scale, with yields of 92% and above.	Apr 2023

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I19-Small Molecule Single Crystal Diffraction

Growth of single-crystal imine-linked covalent organic frameworks using amphiphilic amino-acid derivatives in water