Photocontrolled On-Surface Pseudorotaxane Formation with Well-Ordered Macrocycle Multilayers
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- 作者：Felix B. Schwarz ; Thomas Heinrich ; J. Ole Kaufmann ; Andreas Lippitz ; Dr. Rakesh Puttreddy ; Acad. Prof. Kari Rissanen ; Dr. Wolfgang E. S. Unger and Prof. Christoph A. Schalley
- 刊名：Chemistry - A European Journal
- 出版年：2016
- 出版时间：September 26, 2016
- 年：2016
- 卷：22
- 期：40
- 页码：14383-14389
- 全文大小：2167K
- ISSN：1521-3765
文摘
The photoinduced pseudorotaxane formation between a photoresponsive axle and a tetralactam macrocycle was investigated in solution and on glass surfaces with immobilized multilayers of macrocycles. In the course of this reaction, a novel photoswitchable binding station with azobenzene as the photoswitchable unit and diketopiperazine as the binding station was synthesized and studied by NMR and UV/Vis spectroscopy. Glass surfaces have been functionalized with pyridine-terminated SAMs and subsequently with multilayers of macrocycles through layer-by-layer self assembly. A preferred orientation of the macrocycles could be confirmed by NEXAFS spectroscopy. The photocontrolled deposition of the axle into the surface-bound macrocycle-multilayers was monitored by UV/Vis spectroscopy and led to an increase of the molecular order, as indicated by more substantial linear dichroism effects in angle-resolved NEXAFS spectra.