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O: Fachverband Oberflächenphysik

O 63: Poster DS (joint session DS/MM/O)

O 63.25: Poster

Mittwoch, 20. März 2024, 17:00–19:00, Poster B

Triptycene as a versatile building block for self-assembled monolayers — Takanori Fukushima¹, Manfred Buck², Egbert Zojer³, and •Michael Zharnikov⁴ — ¹Tokyo Institute of Technology, Yokohama 226-8503, Japan — ²EaStCHEM School of Chemistry, University of St Andrews, St Andrews KY16 9ST, UK — ³Institute of Solid State Physics, NAWI Graz, Graz University of Technology, 8010 Graz, Austria — ⁴Angewandte Physikalische Chemie, Universität Heidelberg, 69120 Heidelberg, Germany

When employing self-assembled monolayers (SAMs) for tuning surface- and interface-properties, a strong binding to the substrate, structural uniformity, and the ability to align functional groups and to control their density are desirable. To achieve these goals, tripod systems bearing multiple bonding sites have been developed as an alternative to conventional monodentate systems. A bonding of all three sites has, however, hardly been achieved with the consequence that structural uniformity and orientational order in tripodal SAMs are usually quite poor. To resolve that problem, we designed a series of triptycene-based molecules decorated with three anchoring groups, which can be assembled on different substrates. Depending on the character of the anchoring groups, well-defined tripodal SAMs could be prepared on Au(111), Ag(111), and indium tin oxide. Either unsubstituted or differently substituted triptycene-based molecules were assembled in context of different issues, viz. (i) homogeneous tripodal assembly, (ii) polymorphism and hidden chirality, (iii) on-surface click chemistry, (iv) multiple pathways in charge transfer, and (v) nanofabrication.

Keywords: self-assembled monolayers; triptycene; nanofabrication