Abstract

Electronic delocalization in redox-active polymers may be disrupted by the heterogeneity of the environment that surrounds each monomer. When the differences in monomer redox-potential induced by the environment are small (as compared with the monomer-monomer electronic interactions), delocalization persists. Here we show that guanine (G) runs in double-stranded DNA support delocalization over 4-5 guanine bases. The weak interaction between delocalized G blocks on opposite DNA strands is known to support partially coherent long-range charge transport. The molecular-resolution model developed here finds that the coherence among these G blocks follows an even-odd orbital-symmetry rule and predicts that weakening the interaction between G blocks exaggerates the resistance oscillations. These findings indicate how sequence can be exploited to change the balance between coherent and incoherent transport. The predictions are tested and confirmed using break-junction experiments. Thus, tailored orbital symmetry and structural fluctuations may be used to produce coherent transport with a length scale of multiple nanometres in soft-matter assemblies, a length scale comparable to that of small proteins.

Original languageEnglish (US)
Pages (from-to)941-945
Number of pages5
JournalNature Chemistry
Volume8
Issue number10
DOIs
StatePublished - Oct 1 2016

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Monomers
Guanine
DNA
Charge transfer
Polymers
Proteins
Experiments
Oxidation-Reduction

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Liu, C., Xiang, L., Zhang, Y., Zhang, P., Beratan, D. N., Li, Y., & Tao, N. (2016). Engineering nanometre-scale coherence in soft matter. Nature Chemistry, 8(10), 941-945. https://doi.org/10.1038/nchem.2545

Engineering nanometre-scale coherence in soft matter. / Liu, Chaoren; Xiang, Limin; Zhang, Yuqi; Zhang, Peng; Beratan, David N.; Li, Yueqi; Tao, Nongjian.

In: Nature Chemistry, Vol. 8, No. 10, 01.10.2016, p. 941-945.

Research output: Contribution to journalArticle

Liu, C, Xiang, L, Zhang, Y, Zhang, P, Beratan, DN, Li, Y & Tao, N 2016, 'Engineering nanometre-scale coherence in soft matter', Nature Chemistry, vol. 8, no. 10, pp. 941-945. https://doi.org/10.1038/nchem.2545
Liu C, Xiang L, Zhang Y, Zhang P, Beratan DN, Li Y et al. Engineering nanometre-scale coherence in soft matter. Nature Chemistry. 2016 Oct 1;8(10):941-945. https://doi.org/10.1038/nchem.2545
Liu, Chaoren ; Xiang, Limin ; Zhang, Yuqi ; Zhang, Peng ; Beratan, David N. ; Li, Yueqi ; Tao, Nongjian. / Engineering nanometre-scale coherence in soft matter. In: Nature Chemistry. 2016 ; Vol. 8, No. 10. pp. 941-945.
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