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On‐Surface Driven Formal Michael Addition Produces m ‐Polyaniline Oligomers on Pt(111)
Author(s) -
Ruiz del Árbol Nerea,
SánchezSánchez Carlos,
OteroIrurueta Gonzalo,
Martínez José I.,
Andrés Pedro L.,
GómezHerrero Ana C.,
Merino Pablo,
Piantek Marten,
Serrate David,
Lacovig Paolo,
Lizzit Silvano,
Alemán José,
Ellis Gary J.,
López María F.,
MartínGago José A.
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202009863
Subject(s) - polyaniline , dehydrogenation , rational design , covalent bond , scanning tunneling microscope , materials science , nanostructure , polymer , molecule , nanotechnology , michael reaction , chemistry , polymerization , organic chemistry , catalysis , composite material
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.