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Selective binding in different adsorption sites of a 2D covalent organic framework

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Abstract

This study shows that surface-supported two-dimensional (2D) porous covalent organic frameworks (COFs) can selectively bind different molecules at specific sites via different types of interactions. Scanning tunneling microscopy (STM) images collected at the liquid/solid interface reveal the adsorption of 1,2,4-trichlorobenzene (TCB) in the hexagonal pore of a COF-1 template. A well-defined loop boundary formed by a chain of pentagonal and heptagonal pores allowed the investigation of the effect of pore shape and size on TCB adsorption, suggesting that both geometrical and size effects are important in binding TCB. When both C60 and TCB are present at the solution/solid interface, the TCB molecules are selectively trapped in the pore-site, whereas fullerenes are adsorbed on the top-site of COF-1. While the former structure is stabilized by Cl⋯H hydrogen bonds, the latter is controlled by van der Waals interactions. These results suggest that COFs may offer a powerful platform for the recognition and patterning of guest molecules.

Graphical abstract: Selective binding in different adsorption sites of a 2D covalent organic framework

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Publication details

The article was received on 07 Feb 2017, accepted on 19 Mar 2017 and first published on 24 Mar 2017


Article type: Paper
DOI: 10.1039/C7CE00263G
Citation: CrystEngComm, 2017, Advance Article
  • Open access: Creative Commons BY-NC license
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    Selective binding in different adsorption sites of a 2D covalent organic framework

    D. Cui, J. M. MacLeod, M. Ebrahimi and F. Rosei, CrystEngComm, 2017, Advance Article , DOI: 10.1039/C7CE00263G

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