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. 2023 Jul 17;62(29):e202304313.
doi: 10.1002/anie.202304313. Epub 2023 Jun 12.

Chemically Gradient Hydrogen-Bonded Organic Framework Crystal Film

Abdul Khayum Mohammed  1 , Jésus Raya  2 , Ajmal Pandikassala  3 , Matthew A Addicoat  4 , Safa Gaber  1 , Mohamed Aslam  1 , Liaqat Ali  5 , Sreekumar Kurungot  3 , Dinesh Shetty  1   6
Affiliations

Chemically Gradient Hydrogen-Bonded Organic Framework Crystal Film

Abdul Khayum Mohammed et al. Angew Chem Int Ed Engl. .

Abstract

Hydrogen-bonded organic frameworks (HOFs) are ordered supramolecular solid structures, however, nothing much explored as centimetre-scale self-standing films. The fabrication of such crystals comprising self-supported films is challenging due to the limited flexibility and interaction of the crystals, and therefore studies on two-dimensional macrostructures of HOFs are limited to external supports. Herein, we introduce a novel chemical gradient strategy to fabricate a crystal-deposited HOF film on an in situ-formed covalent organic polymer film (Tam-Bdca-CGHOF). The fabricated film showed versatility in chemical bonding along its thickness from covalent to hydrogen-bonded network. The kinetic-controlled Tam-Bdca-CGHOF showed enhanced proton conductivity (8.3×10-5 S cm-1 ) compared to its rapid kinetic analogue, Tam-Bdca-COP (2.1×10-5 S cm-1 ), which signifies the advantage of bonding-engineering in the same system.

Keywords: Chemical Gradience; Crystal Films; Free-Standing Films; Hydrogen-Bonded Organic Framework; Interfacial Chemistry; Proton Conductivity.

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