Dynamics of Spatially Confined Bisphenol A Trimers in a Unimolecular Network on Ag(111)

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• 作者：Julian A. Lloyd ; Anthoula C. Papageorgiou ; Sybille Fischer ; Seung Cheol Oh ; Özge Saǧlam ; Katharina Diller ; David A. Duncan ; Francesco Allegretti ; Florian Klappenberger ; Martin Stöhr ; Reinhard J. Maurer ; Karsten Reuter ; Joachim Reichert ; Johannes V. Barth
• 刊名：Nano Letters
• 出版年：2016
• 出版时间：March 9, 2016
• 年：2016
• 卷：16
• 期：3
• 页码：1884-1889
• 全文大小：505K
• ISSN：1530-6992

文摘

Bisphenol A (BPA) aggregates on Ag(111) shows a polymorphism between two supramolecular motifs leading to formation of distinct networks depending on thermal energy. With rising temperature a dimeric pairing scheme reversibly converts into a trimeric motif, which forms a hexagonal superstructure with complex dynamic characteristics. The trimeric arrangements notably organize spontaneously into a self-assembled one-component array with supramolecular BPA rotors embedded in a two-dimensional stator sublattice. By varying the temperature, the speed of the rotors can be controlled as monitored by direct visualization. A combination of scanning tunneling microscopy and dispersion-corrected density-functional tight-binding (DFTB-vdW^surf) based molecular modeling reveals the exact atomistic position of each molecule within the assembly as well as the driving force for the formation of the supramolecular rotors.