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      Room Temperature Synthesis of Covalent–Organic Framework Films through Vapor-Assisted Conversion

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          Abstract

          We describe the facile synthesis of several two-dimensional covalent–organic frameworks (2D COFs) as films by vapor-assisted conversion at room temperature. High-quality films of benzodithiophene-containing BDT-COF and COF-5 with tunable thickness were synthesized under different conditions on various substrates. BDT-COF films of several micrometer thickness exhibit mesoporosity as well as textural porosity, whereas thinner BDT-COF films materialize as a cohesive dense layer. In addition, we studied the formation of COF-5 films with different solvent mixture compositions serving as vapor source. Room temperature vapor-assisted conversion is an excellent method to form COF films of fragile precursors and on sensitive substrates.

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          Isoreticular two-dimensional covalent organic frameworks synthesized by on-surface condensation of diboronic acids.

          Thomas Bein, Wolfgang Heckl, Markus Lackinger … (2012)
          On-surface self-condensation of 1,4-benzenediboronic acid was previously shown to yield extended surface-supported, long-range-ordered two-dimensional covalent organic frameworks (2D COFs). The most important prerequisite for obtaining high structural quality is that the polycondensation (dehydration) reaction is carried out under slightly reversible reaction conditions, i.e., in the presence of water. Only then can the subtle balance between kinetic and thermodynamic control of the polycondensation be favorably influenced, and defects that are unavoidable during growth can be corrected. In the present study we extend the previously developed straightforward preparation protocol to a variety of para-diboronic acid building blocks with the aim to tune lattice parameters and pore sizes of 2D COFs. Scanning tunneling microscopy is employed for structural characterization of the covalent networks and of noncovalently self-assembled structures that form on the surface prior to the thermally activated polycondensation reaction.
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            A. COTÉ, A. Benin, N Ockwig … (2005)
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              J. Am. Chem. Soc.

              B. B. Biswal, S CHANDRA, S Kandambeth … (2013)
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                Author and article information

                Journal
                Journal ID (nlm-ta): J Am Chem Soc
                Journal ID (iso-abbrev): J. Am. Chem. Soc
                Journal ID (publisher-id): ja
                Journal ID (coden): jacsat
                Title: Journal of the American Chemical Society
                Publisher: American Chemical Society
                ISSN (Print): 0002-7863
                ISSN (Electronic): 1520-5126
                Publication date (Electronic): 24 December 2014
                Publication date (Print): 28 January 2015
                Volume: 137
                Issue: 3
                Pages: 1016-1019
                Affiliations
                [† ]Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU) , Butenandtstrasse 5-13 (E), 81377 Munich, Germany
                Author notes
                Article
                DOI: 10.1021/ja510895m
                PMC ID: 4706366
                PubMed ID: 25539131
                SO-VID: ece35f68-a12c-4b22-857e-f462d129e530
                Copyright © Copyright © 2014 American Chemical Society
                License:

                This is an open access article published under a Creative Commons Non-Commercial No Derivative Works (CC-BY-NC-ND) Attribution License, which permits copying and redistribution of the article, and creation of adaptations, all for non-commercial purposes.

                History
                Date received : 23 October 2014
                Categories
                Subject: Communication
                Custom metadata
                document-id-old-9 ja510895m
                document-id-new-14 ja-2014-10895m
                ccc-price

                ScienceOpen disciplines: Chemistry
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                ScienceOpen disciplines: Chemistry

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