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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Lüning, Ulrich Beyer, Martin K. Pill, Michael F. Preußke, Nils Berger, Florian Holz, Katharina Clausen-schaumann, Hauke |
| Description | Author Affiliation: Pill MF ( Department of Applied Natural Sciences and Mechatronics, Munich University of Applied Sciences, Lothstraße 34, 80335, Munich, Germany.); Holz K ( Center for Nanoscience (CeNS), Geschwister-Scholl-Platz 1, Munich, Germany.); Preußke N ( Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Olshausenstraße 40, 24098, Kiel, Germany.); Berger F ( Otto-Diels-Institut für Organische Chemie, Christian-Albrechts-Universität zu Kiel, Olshausenstraße 40, 24098, Kiel, Germany.); Clausen-Schaumann H ( Institut für Ionenphysik und Angewandte Physik, Leopold-Franzens-Universität Innsbruck, Technikerstraße 25, 6020, Innsbruck, Austria.); Lüning U ( Department of Applied Natural Sciences and Mechatronics, Munich University of Applied Sciences, Lothstraße 34, 80335, Munich, Germany.); Beyer MK ( Center for Nanoscience (CeNS), Geschwister-Scholl-Platz 1, Munich, Germany.) |
| Abstract | Mechanochemical cycloreversion of cyclobutane is known from ultrasound experiments. It is, however, not clear which forces are required to induce the cycloreversion. In atomic force microscopy (AFM) experiments, on the other hand, it is notoriously difficult to assign the ruptured bond. We have solved this problem through the synthesis of tailored macrocycles, in which the cyclobutane mechanophore is bypassed by an ethylene glycol chain of specific length. This macrocycle is covalently anchored between a glass substrate and an AFM cantilever by polyethylene glycol linkers. Upon mechanical stretching of the macrocycle, cycloreversion occurs, which is identified by a defined length increase of the stretched polymer. The measured length change agrees with the value calculated with the external force explicitly included (EFEI) method. By using two different lengths for the ethylene glycol safety line, the assignment becomes unambiguous. Mechanochemical cycloreversion of cyclobutane is observed at forces above 1.7 nN. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 34 |
| Volume Number | 22 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2016-08-16 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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