Self-Assembled Monolayers of Discotic Liquid Crystalline Thioethers, Discoid Disulfides, and Thiols on Gold: Molecular Engineering of Ordered Surfaces
| Autor: | Sandeep Kumar, James A. Rego, F.J.B. Kremer, Heiko Wolf, Manfred Jaschke, Holger Schönherr, H. Ringsdorf, Ernst Bamberg, Hans-Jürgen Butt |
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| Rok vydání: | 1996 |
| Předmět: |
chemistry.chemical_classification
Chemistry Analytical chemistry Self-assembled monolayer General Chemistry Quartz crystal microbalance Biochemistry Catalysis Contact angle chemistry.chemical_compound Crystallography Colloid and Surface Chemistry Thioether Monolayer Molecule Fourier transform infrared spectroscopy Alkyl |
| Zdroj: | Journal of the American Chemical Society. 118:13051-13057 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja962598+ |
| Popis: | This paper describes a comparative study of self-assembled monolayers of different discoid molecules containing thioether, thiol, or disulfide substituents on gold. Discotic liquid crystalline hexaalkylthio-substituted triphenylenes and tricycloquinazolines, and derivatized triphenylenes with a single long ω-thioalkyl or ω-dithioalkyl substituent, are shown to self-assemble from dilute solution onto gold surfaces. Monolayers are formed owing to the known strong interaction of these functional groups with the gold. The characterization of the monolayers includes contact angle, polarized grazing incidence Fourier transform infrared spectroscopy (FTIR), quartz crystal microbalance (QCM), and atomic force microscopy (AFM) measurements. The discotic hexaalkyl thioethers assemble essentially face-on and without detectable lateral order onto the gold substrate. The alkyl chains do not lie flat on the gold but cover the aromatic cores. In contrast, the aromatic cores of the molecules in the monolayers of the disc... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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