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On‐Surface Synthesis and Characterization of a High‐Spin Aza‐[5]‐Triangulene by Manuel Vilas‐Varela; Francisco Romero‐Lara; Alessio Vegliante; Jan Patrick Calupitan; Adrián Martínez; Lorenz Meyer; Unai Uriarte‐Amiano; Niklas Friedrich; Dongfei Wang; Fabian Schulz; Natalia E. Koval; María E. Sandoval‐Salinas; David Casanova; Martina Corso; Emilio Artacho; Diego Peña; José Ignacio Pascual is a Chemistry article available to read on EtoBox.

What is On‐Surface Synthesis and Characterization of a High‐Spin Aza‐[5]‐Triangulene about?

## Abstract Triangulenes are a class of open‐shell triangular graphene flakes with total spin increasing with their size. In the last years, on‐surface‐synthesis strategies have permitted fabricating and engineering triangulenes of various sizes and structures with atomic precision. However, direct proof of the increasing total spin with their size remains elusive. In this work, we report the combined in‐solution and on‐surface synthesis of a large nitrogen‐doped triangulene (aza‐[5]‐triangulene) on a Au(111) surface, and the detection of its high‐spin ground state. Bond‐resolved scanning tunneling microscopy images uncovered radical states distributed along the zigzag edges, which were detected as weak zero‐bias resonances in scanning tunneling spectra. These spectral features reveal the partial Kondo screening of a high‐spin state. Through a combination of several simulation tools, we find that the observed distribution of radical states is explained by a quintet ground state (__S__=2), instead of the quartet state (__S__=3/2) expected for the neutral species. This confirms that electron transfer to the metal substrate raises the spin of the ground state. We further provide a qua

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Author

Manuel Vilas‐Varela; Francisco Romero‐Lara; Alessio Vegliante; Jan Patrick Calupitan; Adrián Martínez; Lorenz Meyer; Unai Uriarte‐Amiano; Niklas Friedrich; Dongfei Wang; Fabian Schulz; Natalia E. Koval; María E. Sandoval‐Salinas; David Casanova; Martina Corso; Emilio Artacho; Diego Peña; José Ignacio Pascual

Publisher

Wiley

Published

2023

Language

EN

Field

Chemistry (Physical Sciences)