Functionalized 4,4′-Bipyridines: Synthesis and 2D Organization on Highly Oriented Pyrolytic Graphite

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Abstract
Commercial 4,4′-bipyridine is a popular scaffold that is primarily employed as a linker in 3D self-assembled architectures such as metallo-organic frameworks or as a connector in 2D networks. The introduction of alkyl substituents on the bipyridine skeleton is instrumental when 4,4′-bipyridines are used as linkers to form 2D self-assembled patterns on surfaces. Here, several synthetic strategies to access 4,4′-bipyridines functionalized at various positions are described. These easily scalable reactions have been used to introduce a range of alkyl substituents at positions 2 and 2′ or 3 and 3′ and at positions 2,2′ and 6,6′ in the case of tetra-functionalization. Scanning tunneling microscopy studies of molecular monolayers physisorbed at the graphite–solution interface revealed different supramolecular patterns whose motifs are primarily dictated by the nature and position of the alkyl chains.
Funding Information
  • Agence Nationale de la Recherche (ANR-10-LABX-0026 CSC)
  • Centre International de Recherche aux Fronti?res de la Chimie (JWE-CSC-0003)
  • H2020 European Research Council (GA-833707)

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