3D Covalent Organic Frameworks Selectively Crystallized through Conformational Design

Nguyen, Ha L.; Gropp, Cornelius; Ma, Yanhang; Zhu, Chenhui; Yaghi, Omar M.

doi:10.1021/jacs.0c11064

3D Covalent Organic Frameworks Selectively Crystallized through Conformational Design

Journal Article · Thu Nov 12 19:00:00 EST 2020 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/jacs.0c11064· OSTI ID:1838626

^[1]; ^[2]; ^[3]; Zhu, Chenhui ^[4]; ^[1]

UAE Univ., Al-Ain (United Arab Emirates). Joint UAEU-UC Berkeley Laboratories for Materials Innovations; Kavli Energy NanoScience Institute, Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Berkeley Global Science Inst.
Kavli Energy NanoScience Institute, Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States). Berkeley Global Science Inst.
ShanghaiTech Univ. (China)
Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States

In this work, we present a strategy whereby selective formation of imine covalent organic frameworks (COFs) based on linking of triangles and squares into the fjh topology was achieved by the conformational design of the building units. 1,3,5-Trimethyl-2,4,6-tris(4-formylphenyl)benzene (TTFB, triangle) and 1,1,2,2-tetrakis(4-aminophenyl)ethene (ETTA, square) were reticulated into [(TTFB)₄(ETTA)₃]_imine, termed COF-790, which was fully characterized by spectroscopic, microscopic, and X-ray diffraction techniques. COF-790 exhibits permanent porosity and a Brunauer-Emmett-Teller (BET) surface area of 2650 m² g^-1. Key to the formation of this COF in crystalline form is the pre-designed conformation of the triangle and the square units to give dihedral angles in the range of 75-90°, without which the reaction results in the formation of amorphous product. We demonstrate the versatility of our strategy by also reporting the synthesis and characterization of two isoreticular forms of COF-790, COF-791 and COF-792, based on other square building units.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Swiss National Science Foundation; National Natural Science Foundation of China (NSFC); National Institutes of Health (NIH)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1838626

Journal Information:: Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 48 Vol. 142; ISSN 0002-7863

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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3D Covalent Organic Frameworks Selectively Crystallized through Conformational Design

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