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X-ray spectroscopy characterization of self-assembled monolayers of nitrile-substituted oligo(phenylene ethynylene)s with variable chain length
- Source :
- Beilstein Journal of Nanotechnology, Vol 3, Iss 1, Pp 12-24 (2012), Beilstein Journal of Nanotechnology
- Publication Year :
- 2012
- Publisher :
- Beilstein-Institut, 2012.
-
Abstract
- Self-assembled monolayers (SAMs) of nitrile-substituted oligo(phenylene ethynylene) thiols (NC-OPEn) with a variable chain length n (n ranging from one to three structural units) on Au(111) were studied by synchrotron-based high-resolution X-ray photoelectron spectroscopy and near-edge absorption fine-structure spectroscopy. The experimental data suggest that the NC-OPEn molecules form well-defined SAMs on Au(111), with all the molecules bound to the substrate through the gold–thiolate anchor and the nitrile tail groups located at the SAM–ambient interface. The packing density in these SAMs was found to be close to that of alkanethiolate monolayers on Au(111), independent of the chain length. Similar behavior was found for the molecular inclination, with an average tilt angle of ~33–36° for all the target systems. In contrast, the average twist of the OPEn backbone (planar conformation) was found to depend on the molecular length, being close to 45° for the films comprising the short OPE chains and ~53.5° for the long chains. Analysis of the data suggests that the attachment of the nitrile moiety, which served as a spectroscopic marker group, to the OPEn backbone did not significantly affect the molecular orientation in the SAMs.
- Subjects :
- Materials science
Nitrile
Stereochemistry
General Physics and Astronomy
02 engineering and technology
010402 general chemistry
lcsh:Chemical technology
01 natural sciences
lcsh:Technology
Full Research Paper
chemistry.chemical_compound
Phenylene
Monolayer
Nanotechnology
Molecule
Moiety
General Materials Science
lcsh:TP1-1185
twist angle
Electrical and Electronic Engineering
Spectroscopy
lcsh:Science
X-ray absorption spectroscopy
lcsh:T
oligo(phenylene ethynylene)
self-assembled monolayers
Self-assembled monolayer
021001 nanoscience & nanotechnology
lcsh:QC1-999
0104 chemical sciences
Nanoscience
Crystallography
chemistry
nitrile substitution
lcsh:Q
0210 nano-technology
lcsh:Physics
Subjects
Details
- Language :
- English
- ISSN :
- 21904286
- Volume :
- 3
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Beilstein Journal of Nanotechnology
- Accession number :
- edsair.doi.dedup.....6a17b90acaedab7dee788f8794bf935c