NDLI: Tripodal Binding Units for Self-Assembled Monolayers on Gold: A Comparison of Thiol and Thioether Headgroups

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Tripodal Binding Units for Self-Assembled Monolayers on Gold: A Comparison of Thiol and Thioether Headgroups

Content Provider	PubMed Central
Author	Weidner, Tobias Ballav, Nirmalya Ulrich, Siemeling Dennis, Troegel Walter, Tim Tacke, Reinhold Castner, David G. Zharnikov, Michael
Abstract	Whereas thiols and thioethers are frequently used as binding units of oligodentate precursor molecules to fabricate self-assembled monolayers (SAMs) on coinage metal and semiconductor surfaces, their use for tridentate bonding configuration is still questionable. Against this background, novel tridentate thiol ligands, PhSi(CH2SH)3 (PTT) and p-Ph-C6H4Si(CH2SH)3 (BPTT), were synthesized and used as tripodal adsorbate molecules for the fabrication of SAMs on Au(111). These SAMs were characterized by X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS) spectroscopy. The PTT and BPTT films were compared with the analogous systems comprised of same tripodal ligands with thioether instead of thiol binding units (anchors). XPS and NEXAFS data suggest that the binding uniformity, packing density, and molecular alignment of the thiol-based ligands in the respective SAMs is superior to their thioether counterparts. In addition, the thiol-based films showed significantly lower levels of contamination. Significantly, the quality of the PTT SAMs on Au(111) was found to be even higher than that of the films formed from the respective monodentate counterpart, benzenethiol. The results obtained allow for making some general conclusions on the specific character of molecular self-assembly in the case of tridentate ligands.
Related Links	http://dx.doi.org/10.1021/jp906367t
Ending Page	19617
Page Count	9
Starting Page	19609
File Format	PDF
ISSN	19327447
e-ISSN	19327455
Journal	The journal of physical chemistry. C, Nanomaterials and interfaces
Issue Number	45
Volume Number	113
Language	English
Publisher Date	2009-11-12
Access Restriction	Open
Subject Keyword	Energy(all) Physical and Theoretical Chemistry Electronic, Optical and Magnetic Materials Surfaces, Coatings and Films Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Energy Surfaces, Coatings and Films Physical and Theoretical Chemistry Electronic, Optical and Magnetic Materials

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