Probing the chemical structure of monolayer covalent-organic frameworks grown via Schiff-base condensation reactions.
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Peer-reviewed
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Abstract
Two-dimensional covalent-organic frameworks (2D-COFs) on surfaces offer a facile route to new 2D materials. Schiff-base condensation reactions have proven to be an effective fabrication route for such materials. We present scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS) studies of porphyrin 2D-COFs grown at a solid-vapour interface. XPS shows that covalent links between porphyrins consist of a mixture of imines and hemiaminals, a non-conjugated intermediate in the Schiff-base condensation reaction. These results demonstrate that environmental conditions during growth can have an important impact on the chemical composition of Schiff-base 2D-COFs.
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Keywords
0306 Physical Chemistry (incl. Structural), 0305 Organic Chemistry
Journal Title
Chem Commun (Camb)
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Journal ISSN
1359-7345
1364-548X
1364-548X
Volume Title
52
Publisher
Royal Society of Chemistry (RSC)