Large Variations in the Single-Molecule Conductance of Cyclic and Bicyclic Silanes

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Marc H. Garner
  • Zhichun Shangguan
  • Yan Chen
  • Qianwen Zheng
  • Timothy A. Su
  • Madhav Neupane
  • Taifeng Liu
  • Michael L. Steigerwald
  • Fay Ng
  • Colin Nuckolls
  • Shengxiong Xiao
  • Gemma C. Solomon
  • Latha Venkataraman

Detail(s)

Original languageEnglish
Pages (from-to)15080-15088
Journal / PublicationJournal of the American Chemical Society
Volume140
Issue number44
Publication statusPublished - 7 Nov 2018
Externally publishedYes

Abstract

Linear silanes are efficient molecular wires due to strong σ-conjugation in the transoid conformation; however, the structure-function relationship for the conformational dependence of the single-molecule conductance of silanes remains untested. Here we report the syntheses, electrical measurements, and theoretical characterization of four series of functionalized cyclic and bicyclic silanes including a cyclotetrasilane, a cyclopentasilane, a bicyclo[2.2.1]heptasilane, and a bicyclo[2.2.2]octasilane, which are all extended by linear silicon linkers of varying length. We find an unusual variation of the single-molecule conductance among the four series at each linker length. We determine the relative conductance of the (bi)cyclic silicon structures by using the common length dependence of the four series rather than comparing the conductance at a single length. In contrast with the cyclic π-conjugated molecules, the conductance of σ-conjugated (bi)cyclic silanes is dominated by a single path through the molecule and is controlled by the dihedral angles along this path. This strong sensitivity to molecular conformation dictates the single-molecule conductance of σ-conjugated silanes and allows for systematic control of the conductance through molecular design.

Bibliographic Note

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Citation Format(s)

Large Variations in the Single-Molecule Conductance of Cyclic and Bicyclic Silanes. / Li, Haixing; Garner, Marc H.; Shangguan, Zhichun et al.

In: Journal of the American Chemical Society, Vol. 140, No. 44, 07.11.2018, p. 15080-15088.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review