Probing the chemical structure of monolayer covalent-organic frameworks grown via Schiff-base condensation reactions. Issue 64 (20th July 2016)

• Record Type: Journal Article
• Authors: Hu, Ya; Goodeal, Niall; Chen, Ying; Ganose, Alex M.; Palgrave, Robert G.; Bronstein, Hugo; Blunt, Matthew O.
• Is Part Of: Chemical communications. Volume 52:Issue 64(2016)
• Page Start: 9941
• Page End: 9944
• Publication Date: 2016-07-20
• Subjects: Chemistry -- Periodicals; 540
• DOI: 10.1039/c6cc03895f
• Languages: English
• ISSNs: 1359-7345

Abstract

Abstract : XPS and STM analysis shows that covalent links formed within a surface-supported Schiff-base 2D-COF consist of a mixture of imine and hemiaminal groups. 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.