Synthesis and characterization of peri-heptacene on a metallic surface

0560757 - FZÚ 2023 RIV DE eng J - Článek v odborném periodiku
Biswas, K. - Urgel, J. I. - Ajayakumar, M.R. - Ma, J. - Sánchez-Grande, A. - Edalatmanesh, Shayan - Lauwaet, K. - Mutombo, Pingo - Gallego, J. M. - Miranda, R. - Jelínek, Pavel - Feng, X.L. - Écija, D.
Synthesis and characterization of peri-heptacene on a metallic surface.
Angewandte Chemie - International Edition. Roč. 61, č. 23 (2022), č. článku e202114983. ISSN 1433-7851. E-ISSN 1521-3773
Grant CEP: GA ČR(CZ) GX20-13692X
Grant ostatní: AV ČR(CZ) AP1601
Program: Akademická prémie - Praemium Academiae
Výzkumná infrastruktura: CzechNanoLab - 90110
Institucionální podpora: RVO:68378271
Klíčová slova: carbon magnetism * open-shell character * periacenes * scanning Tunneling Microscopy * surface Chemistry
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
Impakt faktor: 16.6, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1002/anie.202114983

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 (Jeff) of 49 meV.

Trvalý link: https://hdl.handle.net/11104/0333952