Synthesis and Characterization of peri-Heptacene on a Metallic Surface.

Autor: Biswas K; IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049, Madrid, Spain., Urgel JI; IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049, Madrid, Spain., Ajayakumar MR; Center for Advancing Electronics and Faculty of Chemistry and Food Chemistry, Technical University of Dresden, 01062, Dresden, Germany., Ma J; Center for Advancing Electronics and Faculty of Chemistry and Food Chemistry, Technical University of Dresden, 01062, Dresden, Germany., Sánchez-Grande A; IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049, Madrid, Spain., Edalatmanesh S; Institute of Physics of the Czech Academy of Science, 16253, Praha, Czech Republic.; Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, 771 46, Olomouc, Czech Republic., Lauwaet K; IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049, Madrid, Spain., Mutombo P; Institute of Physics of the Czech Academy of Science, 16253, Praha, Czech Republic., Gallego JM; Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, 28049, Madrid, Spain., Miranda R; IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049, Madrid, Spain.; Departamento de Física de la Materia Condensada, Universidad Autónoma de Madrid, 28049, Madrid, Spain., Jelínek P; Institute of Physics of the Czech Academy of Science, 16253, Praha, Czech Republic.; Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, 771 46, Olomouc, Czech Republic., Feng X; Center for Advancing Electronics and Faculty of Chemistry and Food Chemistry, Technical University of Dresden, 01062, Dresden, Germany., Écija D; IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049, Madrid, Spain.
Jazyk: angličtina
Zdroj: Angewandte Chemie (International ed. in English) [Angew Chem Int Ed Engl] 2022 Jun 07; Vol. 61 (23), pp. e202114983. Date of Electronic Publication: 2022 Apr 28.
DOI: 10.1002/anie.202114983
Abstrakt: The synthesis of long n-peri-acenes (n-PAs) is challenging as a result of their inherent open-shell radical character, which arises from the presence of parallel zigzag edges beyond a certain n value. They are considered as π-electron model systems to study magnetism in graphene nanostructures; being potential candidates in the fabrication of optoelectronic and spintronic devices. Here, we report the on-surface formation of the largest pristine member of the n-PA family, i.e. peri-heptacene (n=7, 7-PA), obtained on an Au(111) substrate under ultra-high vacuum conditions. Our high-resolution scanning tunneling microscopy investigations, complemented by theoretical simulations, provide insight into the chemical structure of this previously elusive compound. In addition, scanning tunneling spectroscopy reveals the antiferromagnetic open-shell singlet ground state of 7-PA, exhibiting singlet-triplet spin-flip inelastic excitations with an effective exchange coupling (J eff ) of 49 meV.
(© 2022 Wiley-VCH GmbH.)
Databáze: MEDLINE
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