Charge Transport across DNA-Based Three-Way Junctions.

Journal Article (Journal Article)

DNA-based molecular electronics will require charges to be transported from one site within a 2D or 3D architecture to another. While this has been shown previously in linear, π-stacked DNA sequences, the dynamics and efficiency of charge transport across DNA three-way junction (3WJ) have yet to be determined. Here, we present an investigation of hole transport and trapping across a DNA-based three-way junction systems by a combination of femtosecond transient absorption spectroscopy and molecular dynamics simulations. Hole transport across the junction is proposed to be gated by conformational fluctuations in the ground state which bring the transiently populated hole carrier nucleobases into better aligned geometries on the nanosecond time scale, thus modulating the π-π electronic coupling along the base pair sequence.

Full Text

Duke Authors

Cited Authors

  • Young, RM; Singh, APN; Thazhathveetil, AK; Cho, VY; Zhang, Y; Renaud, N; Grozema, FC; Beratan, DN; Ratner, MA; Schatz, GC; Berlin, YA; Lewis, FD; Wasielewski, MR

Published Date

  • April 2015

Published In

Volume / Issue

  • 137 / 15

Start / End Page

  • 5113 - 5122

PubMed ID

  • 25822073

Electronic International Standard Serial Number (EISSN)

  • 1520-5126

International Standard Serial Number (ISSN)

  • 0002-7863

Digital Object Identifier (DOI)

  • 10.1021/jacs.5b00931


  • eng