On-Surface Synthesis and Characterization of Acene-Based Nanoribbons Incorporating Four-Membered Rings.

Fiche publication

Date publication

septembre 2019

Journal

Chemistry (Weinheim an der Bergstrasse, Germany)

Auteurs

Membres identifiés du Cancéropôle Est :
Dr NICOLAI Adrien

Tous les auteurs :
Sánchez-Sánchez C, Dienel T, Nicolaï A, Kharche N, Liang L, Daniels C, Meunier V, Liu J, Feng X, Müllen K, Sánchez-Valencia JR, Gröning O, Ruffieux P, Fasel R

Lien Pubmed

https://www.ncbi.nlm.nih.gov/pubmed/31190412

Résumé

A bottom up method for the synthesis of unique tetracene-based nanoribbons, which incorporate cyclobutadiene moieties as linkers between the acene segments, is reported. These structures were achieved through the formal [2+2] cycloaddition reaction of ortho-functionalized tetracene precursor monomers. The formation mechanism and the electronic and magnetic properties of these nanoribbons were comprehensively studied by means of a multitechnique approach. Ultra-high vacuum scanning tunneling microscopy showed the occurrence of metal-coordinated nanostructures at room temperature and their evolution into nanoribbons through formal [2+2] cycloaddition at 475 K. Frequency-shift non-contact atomic force microscopy images clearly proved the presence of bridging cyclobutadiene moieties upon covalent coupling of activated tetracene molecules. Insight into the electronic and vibrational properties of the so-formed ribbons was obtained by scanning tunneling microscopy, Raman spectroscopy, and theoretical calculations. Magnetic properties were addressed from a computational point of view, allowing us to propose promising candidates to magnetic acene-based ribbons incorporating four-membered rings. The reported findings will increase the understanding and availability of new graphene-based nanoribbons with high potential in future spintronics.