Valence Electron Orbitals of an Oligo(p-phenylene-ethynylene)thiol on Gold

Published

March 1, 2004

Author(s)

Christopher D. Zangmeister, Steven W. Robey, Roger D. van Zee, Yuxing Yao, J M. Tour

Abstract

One- and two-photon photoemission spectra have been measured for monolayers of oligo(para-phenylene-ethynylene) thiolate chemisorbed on gold surfaces. Within 5 eV of the Fermi level, four states are observed, two occupied (2.0 eV and 4.0 eV below the Fermi level) and two unoccupied (2.5 eV and 5.3 eV). The two states closest the Fermi level are assigned to conjugated states along the backbone of the molecule, and the other two are assigned to electronic conjugated states formed the ortho carbons. From this assignment, the charge-transport gap energy is estimated to be between 3.7 eV and 5.4 eV.

Citation

Journal of the American Chemical Society

Volume

126

Issue

No. 11

Pub Type

Journals

Keywords

OPE, photoemission, SAM, self-assembly, valence levels

Citation

Zangmeister, C. , Robey, S. , van, R. , Yao, Y. and Tour, J. (2004), Valence Electron Orbitals of an Oligo(p-phenylene-ethynylene)thiol on Gold, Journal of the American Chemical Society (Accessed October 13, 2025)