Aggregation of C70-Fragment Buckybowls on Surfaces: π–H and π–π Bonding in Bowl Up-Side-Down Ensembles

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• 作者：Quirin S. Stöckl ; Ya-Chu Hsieh ; Anaïs Mairena ; Yao-Ting Wu ; Karl-Heinz Ernst
• 刊名：Journal of the American Chemical Society
• 出版年：2016
• 出版时间：May 18, 2016
• 年：2016
• 卷：138
• 期：19
• 页码：6111-6114
• 全文大小：354K
• 年卷期：0
• ISSN：1520-5126

文摘

The self-assembly of the C₃₈H₁₄-buckybowl, a fragment bowl of the C₇₀ fullerene, has been studied with scanning tunneling microscopy on the Cu(111) surface. Isolated molecules adsorb bowl opening-up with the center C6 ring parallel to the surface. In extended 2D islands, however, 1/3 of the molecules are oriented such that the bowl opening points down. From a detailed analysis of relative orientation of the molecules, the nature of intermolecular lateral interactions is identified. In densely packed islands, π–π bonding between convex sides of the bowls dominate, while π–H bonding between rim and convex sides plays the important role in small molecular 2D clusters.