Electron transport in bipyridinium films

Françisco M. Raymo, Robert J. Alvarado

Research output: Contribution to journalReview article

16 Scopus citations

Abstract

Bipyridinium dications are versatile building blocks for the assembly of functional materials. In particular, their reliable electrochemical response has encouraged the design of electroactive films. Diverse and elegant experimental strategies to coat metallic and semiconducting electrodes with bipyridinium compounds have, in fact, emerged over the past two decades. The resulting interfacial assemblies span from a few nanometers to several micrometers in thickness. They incorporate from a single molecular layer to large collections of entangled polymer chains. They transport electrons efficiently from the electrode surface to the film/solution interface and vice versa. Electron self-exchange between and the physical diffusion of the bipyridinium building blocks conspire in defining the charge transport properties of these fascinating electroactive assemblies. Often, the matrix of electron-deficient bipyridinium dications can be exploited to entrap electron-rich analytes. Electrostatic interactions promote the supramolecular association of the guests with the surface-confined host matrix. Furthermore, chromophoric sites can be coupled to the bipyridinium dications to produce photosensitive arrays capable of harvesting light and generating current. Thus, thorough investigations on the fundamental properties of these functional molecule-based materials can lead to promising applications in electroanalysis and solar energy conversion, while contributing to advances in the basic understanding of electron transport in interfacial assemblies.

Original languageEnglish (US)
Pages (from-to)204-218
Number of pages15
JournalChemical Record
Volume4
Issue number3
DOIs
StatePublished - Oct 15 2004

Keywords

  • Bipyridinium compounds
  • Electroactive films
  • Electron transport
  • Modified electrodes
  • Self-assembly

ASJC Scopus subject areas

  • Chemistry(all)

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