High Photoreactivity of o-Nitrobenzyl Ligands on Gold
| Autor: | Xi Guo, John R. Morris, Hans D. Robinson, Chalongrat Daengngam, S. Brandon Thorpe, Stefan V. Stoianov, Webster L. Santos |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
chemistry.chemical_classification
Ligand Photochemistry Fluorescence Surfaces Coatings and Films Electronic Optical and Magnetic Materials Metal Wavelength Optical phenomena General Energy chemistry visual_art Monolayer Thiol visual_art.visual_art_medium Quantum efficiency Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry C. 117:14165-14175 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp4019102 |
| Popis: | We have studied the photopatterning of a gold surface functionalized with a self-assembled monolayer of an o-nitrobenzyl-based photouncaging ligand bound to the gold surface with a dual thiol anchor. We find that the dose of UV light required to induce the photoreaction on gold is very similar to the dose in an alcohol solution, even though many optical phenomena are strongly suppressed on metal surfaces. We attribute this finding to a combination of the large skin depth in gold at UV wavelengths, the high speed of the photoreaction, and the spatially indirect nature of the lowest excited singlet. Any photoreactive compounds where the quantum efficiency of fluorescence is sufficiently low, preferably no larger than about 10–5 in the case of gold surfaces, will show a similarly high photoreactivity in metal-surface monolayers. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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