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Issue 33, 2017, Issue in Progress
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Direct covalent grafting of an organic radical core on gold and silver

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Abstract

The functionalisation of surfaces with organic radicals, such as perchlorotriphenylmethyl (PTM) radicals or tris(2,4,6-trichloro-phenyl)methyl (TTM) radicals, is appealing for the development of molecular spintronic devices. Conventionally, organic radicals are chemisorbed to metal substrates by using long alkyl or aromatic spacers resulting in a weak spin–electron coupling between the radical and the substrate. To circumvent this problem, here we have employed a new design strategy for the fabrication of radical self-assembled monolayers (r-SAMs). This newly designed radical–anchor (R–A) molecule, a TTM based radical disulfide (1), can be easily synthesized and it was here characterized by electron spin resonance (ESR), cyclic voltammetry (CV) and superconducting quantum interference device magnetometry (SQUID). We have succeeded in fabricating TTM based r-SAMs by using thiolate bonds (Au–S and Ag–S) where the TTM cores are only one-atom distance from the metal surface for the first time. The resultant robust 1/Au and 1/Ag r-SAMs were well characterized, and the electrochemical and the magnetic properties were unambiguously confirmed, proving the persistence of the molecular spin.

Graphical abstract: Direct covalent grafting of an organic radical core on gold and silver

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Publication details

The article was received on 09 Feb 2017, accepted on 24 Mar 2017 and first published on 05 Apr 2017


Article type: Paper
DOI: 10.1039/C7RA01686G
Citation: RSC Adv., 2017,7, 20076-20083
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    Direct covalent grafting of an organic radical core on gold and silver

    M. R. Ajayakumar, I. Alcón, S. T. Bromley, J. Veciana, C. Rovira and M. Mas-Torrent, RSC Adv., 2017, 7, 20076
    DOI: 10.1039/C7RA01686G

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