Deposition of Ordered Layers of Tetralactam Macrocycles and Ether Rotaxanes on Pyridine-Terminated Self-Assembled Monolayers on Gold

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• 作者：Sebastian Richter ; Johannes Poppenberg ; Christoph H.-H. Traulsen ; Erik Darlatt ; Anja Sokolowski ; Dominik Sattler ; Wolfgang E. S. Unger ; Christoph A. Schalley
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：October 3, 2012
• 年：2012
• 卷：134
• 期：39
• 页码：16289-16297
• 全文大小：541K
• 年卷期：v.134,no.39(October 3, 2012)
• ISSN：1520-5126

文摘

The deposition of tetralactam macrocycles and the corresponding benzyl ether rotaxanes on gold substrates is investigated for the first time exploiting metallo-supramolecular chemistry. Two pyridine-terminated self-assembled monolayers (SAMs) are developed that are used as well-ordered template layers. The two SAMs differ with respect to the rigidity of the terminal pyridines as shown by angle-resolved near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The template layers are then used for the metal-mediated self-assembly of macrocylces and rotaxanes on solid supports. The SAM with the more rigid terminal pyridine shows a higher coverage with the macrocycles and is therefore preferable. Angle-resolved NEXAFS spectroscopy also shows the deposited supramolecules to be oriented preferentially upright. This order is only achieved for the macrocycles through the deposition on the more rigid SAM template, whereas rotaxanes form oriented layers on both SAMs. Time-of-flight secondary-ion mass spectrometry analysis was used to determine the deposition time required for the self-assembly process.