Ruiz del Árbol N, Sánchez‐Sánchez C, Otero‐Irurueta G, Martínez JI, de Andrés PL, Gómez‐Herrero AC, Merino P, Piantek M, Serrate D, Lacovig P, Lizzit S, Alemán J, Ellis GJ, López MF, Martín‐Gago JA. On-Surface Driven Formal Michael Addition Produces m-Polyaniline Oligomers on Pt(111).
Angew Chem Int Ed Engl 2020;
59:23220-23227. [PMID:
32761699 PMCID:
PMC7116460 DOI:
10.1002/anie.202009863]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Indexed: 11/08/2022]
Abstract
On-surface synthesis is emerging as a highly rational bottom-up methodology for the synthesis of molecular structures that are unattainable or complex to obtain by wet chemistry. Here, oligomers of meta-polyaniline, a known ferromagnetic polymer, were synthesized from para-aminophenol building-blocks via an unexpected and highly specific on-surface formal 1,4 Michael-type addition at the meta position, driven by the reduction of the aminophenol molecule. We rationalize this dehydrogenation and coupling reaction mechanism with a combination of in situ scanning tunneling and non-contact atomic force microscopies, high-resolution synchrotron-based X-ray photoemission spectroscopy and first-principles calculations. This study demonstrates the capability of surfaces to selectively modify local molecular conditions to redirect well-established synthetic routes, such as Michael coupling, towards the rational synthesis of new covalent nanostructures.
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