Making a Molecular Wire: Charge and Spin Transport through para-Phenylene Oligomers

Emily A. Weiss, Michael J. Ahrens, Louise E. Sinks, Alexey V. Gusev, Mark A. Ratner, Michael R. Wasielewski

Research output: Contribution to journalArticle

323 Citations (Scopus)

Abstract

Functional molecular wires are essential for the development of molecular electronics. Charge transport through molecules occurs primarily by means of two mechanisms, coherent superexchange and incoherent charge hopping. Rates of charge transport through molecules in which superexchange dominates decrease approximately exponentially with distance, which precludes using these molecules as effective molecular wires. In contrast, charge transport rates through molecules in which incoherent charge hopping prevails should display nearly distance independent, wirelike behavior. We are now able to determine how each mechanism contributes to the overall charge transport characteristics of a donor-bridge-acceptor (D-B-A) system, where D = phenothiazine (PTZ), B = p-oligophenylene, and A = perylene-3,4:9,10-bis(dicarboximide) (PDI), by measuring the interaction between two unpaired spins within the system's charge separated state via magnetic field effects on the yield of radical pair and triplet recombination product.

Original languageEnglish
Pages (from-to)5577-5584
Number of pages8
JournalJournal of the American Chemical Society
Volume126
Issue number17
DOIs
Publication statusPublished - May 5 2004

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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