The AFM measured force required to rupture the dithiolate linkage of thioctic acid to gold is less than the rupture force of a simple gold-alkyl thiolate bond
| Autor: | Timothy V. Ratto, Kevin C. Langry, Michael W. Mcelfresh, Robert E. Rudd |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
chemistry.chemical_classification
Thioctic Acid Stereochemistry Atomic force microscopy chemistry.chemical_element Substrate (chemistry) Surfaces and Interfaces Condensed Matter Physics Sulfur Crystallography chemistry Transition metal Electrochemistry Thiol General Materials Science Spectroscopy Alkyl |
| Zdroj: | Langmuir : the ACS journal of surfaces and colloids. 21(26) |
| ISSN: | 0743-7463 |
| Popis: | We show with atomic force microscopy that thioctic acid, a spatially constrained system with two sulfur linkages to gold, is less stable to tensile stress than a thiolate with a single attachment to gold. The force required to remove the dithiolate-linked thioctic acid was 0.31 ± 0.13 nN, whereas the force required to remove a simple thiolate from the gold substrate was 1.05 ± 0.29 nN. These results suggest that SAMs of densely packed or polypodal thiols may be substantially less stable under tensile stress than previously recognized and that the additional thiolate linkages may not only fail to increase the overall strength of attachment but could actually reduce it. |
| Databáze: | OpenAIRE |
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