High Photoreactivity of o-Nitrobenzyl Ligands on Gold

详细信息    查看全文

• 作者：Chalongrat Daengngam ; S. Brandon Thorpe ; Xi Guo ; Stefan V. Stoianov ; Webster L. Santos ; John R. Morris ; Hans D. Robinson
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：July 11, 2013
• 年：2013
• 卷：117
• 期：27
• 页码：14165-14175
• 全文大小：634K
• 年卷期：v.117,no.27(July 11, 2013)
• ISSN：1932-7455

文摘

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^鈥? in the case of gold surfaces, will show a similarly high photoreactivity in metal-surface monolayers.