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A 2D-Covalent Organic Framework with Interlayer Hydrogen Bonding Oriented Through Designed Non-Planarity

preprint
submitted on 28.03.2020, 03:22 and posted on 30.03.2020, 09:05 by Sampath B. Alahakoon, Kui Tan, Haardik Pandey, Gregory T. McCandless, Daniel Grinffiel, Alejandra Durand-Silva, T. Thonhauser, Ron Smaldone

We report the synthesis and characterization of a new class of 2D-covalent organic frameworks, called COFamides, whose layers are held together by amide hydrogen bonds. To accomplish this, we have designed monomers with a non-planar structure that arises from steric crowding, forcing the amide side groups out of plane with the COF sheets orienting the hydrogen bonds between the layers. The presence of these hydrogen bonds provides significant structural stabilization as demonstrated by comparison to control structures that lack hydrogen bonding capability, resulting in lower surface area and crystallinity. We have characterized both azine and imine-linked versions of these COFs, named COFamide-1 and -2, respectively, for their surface areas, pore sizes and crystallinity. In addition to these more conventional characterization methods, we also used variable temperature infrared spectroscopy (VT-IR) methods and van der Waals density functional calculations to directly observe the presence of hydrogen bonding.

Funding

Army Research Laboratory (W911NF-18-2-0035)

Department of Energy (DE-SC0019902)

Consejo Nacional de Ciencia y Tecnología of Mexico

History

Email Address of Submitting Author

ronald.smaldone@utdallas.edu

Institution

University of Texas, Dallas

Country

United States of America

ORCID For Submitting Author

0000-0003-4560-7079

Declaration of Conflict of Interest

none

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