Year: 2021
Type: article
Abstract: Samori opened the discussion of the introductory lecture by Klaus Müllen: You have introduced the concept of chirality in graphene nanoribbons.How can this be synthetically achieved?Do you have control over the handedness?Can you please put this into a general context, highlighting some implications and impacts of this achievement?Klaus Müllen replied: Planar GNRs have mirror symmetry and are thus achiral.This is no longer true when placing them on a surface.Therefore, GNRs made by on-surface synthesis can become chiral if the monomeric building blocks give rise to a non-symmetric edge structure.The alternative approach toward chiral GNRs, like in helicenes, rests upon non-planarity.This is somewhat reminiscent of the corrugation in graphene and can, in principle, be achieved by strong spatial overlap of peripheral substituents or incorporation of veand seven-membered rings.Toward control of handedness, enantiomerically pure subunits of helical GNRs have been obtained by separation, but not by enantioselective synthesis.This is understandable in view of the UHV-deposition of oligophenyl precursors, which can lay down from either side, but also in view of the cyclodehydrogenation route which so far cannot be performed enantioselectively.GNRs hold immense promise as a new generation of semiconductors and even topological insulators, but chirality opens up additional opportunities.These include recognition and sensing when depositing small guest molecules, emission of circularly polarized light and transport of spins.(2:[2]2) Alberto Bianco asked: What are the yields of the different types of graphenes in solution?What is the amount of isolated graphenes you can obtain?
Source: Faraday Discussions
DOI: 10.1039/d1fd90002a
Authors: Claudia Backes, Alberto Bianco, Cinzia Casiraghi, Fernando Galembeck, Raju Kumar Gupta, Mark C. Hersam, Ali Reza Kamali, Miroslav Kolíbal, Vladimir Kolosov, Vimal Kumar, Wai Hin Lee, Natalia Martsinovich, Michele Melchionna, Klaus Müllen, Andrea Oyarzun, Vincenzo Palermo, Maurizio Prato, Paolo Samori, Sekar Sampath, Alessandro Silvestri, Dumitru Sirbu, Ruohong Sui, Andrey Turchanin, Cecilia Wetzl, Iain A. Wright, Zhenyuan Xia, Xiaodong Zhuang
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W3138346501