These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
2 files

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

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.


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

Department of Energy (DE-SC0019902)

Consejo Nacional de Ciencia y Tecnología of Mexico


Email Address of Submitting Author


University of Texas, Dallas


United States of America

ORCID For Submitting Author


Declaration of Conflict of Interest