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Zhang H, Lu J, Zhao XJ, Li B, Zhou H, Zhang Y, Niu G, Fu B, Gao L, Tan YZ, Cai J. Length-Dependent Magnetic Evolution of Anthenes on Au(111). Angew Chem Int Ed Engl 2023; 62:e202315216. [PMID: 37933811 DOI: 10.1002/anie.202315216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 11/06/2023] [Accepted: 11/07/2023] [Indexed: 11/08/2023]
Abstract
Nanographenes with zigzag edges, for example, anthenes, exhibit a unique nonbonding π-electron state, which can be described as a spin-polarized edge state that yields specific magnetic ground state. However, prior researches on the magnetism of anthenes with varying lengths on a surface is lacking. This study systematically fabricated anthenes with inherent zigzag carbon atoms of different lengths ranging from bisanthene to hexanthene. Their magnetic evolution on the Au(111) surface was analyzed through bond-resolved scanning probe techniques and density functional theory calculations. The analyses revealed a transition in magnetic properties associated with the length of the anthenes, arising from the imbalance between hybridization energy and the Coulomb repulsion between valence electrons. With the increasing length of the anthenes, the ground state transforms gradually from a closed-shell to an antiferromagnetic open-shell singlet, exhibiting a weak exchange coupling of 4 meV and a charge transfer-induced doublet. Therefore, this study formulated a chemically tunable platform to explore size-dependent π magnetism at the atomic scale, providing a framework for research in organic spintronics.
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Affiliation(s)
- Hui Zhang
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Jianchen Lu
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Xin-Jing Zhao
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Baijin Li
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Hangjing Zhou
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Yong Zhang
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Gefei Niu
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Boyu Fu
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
| | - Lei Gao
- Faculty of Science, Kunming University of Science and Technology, Kunming, 650500, China
| | - Yuan-Zhi Tan
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China
| | - Jinming Cai
- Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China
- Southwest United Graduate School, Kunming, 650093, China
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Ortuño AM, Reiné P, Álvarez de Cienfuegos L, Márquez IR, Dednam W, Lombardi EB, Palacios JJ, Leary E, Longhi G, Mujica V, Millán A, González MT, Zotti LA, Miguel D, Cuerva JM. Chiral Single-Molecule Potentiometers Based on Stapled ortho- Oligo(phenylene)ethynylenes. Angew Chem Int Ed Engl 2023; 62:e202218640. [PMID: 36806838 DOI: 10.1002/anie.202218640] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/17/2023] [Accepted: 02/20/2023] [Indexed: 02/22/2023]
Abstract
We report on the chemical design of chiral molecular junctions with stress-dependent conductance, whose helicity is maintained during the stretching of a single molecule junction due to the stapling of both ends of the inner helix. In the reported compounds, different conductive pathways are observed, with clearly different conductance values and plateau-length distributions, attributed to different conformations of the helical structures. The large chiro-optical responses and the potential use of these molecules as unimolecular spin filters have been theoretically proved using state-of-the-art Density Functional Theory (DFT) calculations, including a fully ab-initio estimation of the CISS-originating spin polarization which is done, for the first time, for a realistic molecular system.
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Affiliation(s)
- Ana M Ortuño
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Pablo Reiné
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Luis Álvarez de Cienfuegos
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Irene R Márquez
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Wynand Dednam
- Department of Physics, University of South Africa, Science Campus, Private Bag X6, Florida Park, 1710, South Africa
| | - Enrico B Lombardi
- Department of Physics, University of South Africa, Science Campus, Private Bag X6, Florida Park, 1710, South Africa
| | - Juan J Palacios
- Departamento de Física de la Materia Condensada, Instituto Nicolás Cabrera (INC) and IFIMAC, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
| | - Edmund Leary
- Fundación IMDEA Nanociencia, 28049, Madrid, Spain
| | - Giovanna Longhi
- Dipartimento di Medicina Molecolare e Traslazionale, Universitá di Brescia, Viale Europa 11, 25121, Brescia, Italy
| | - Vladimiro Mujica
- School of Molecular Sciences, Arizona State University, Tempe, AZ 85287, USA.,Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), P.K. 1072, 20018, Donostia, Euskadi, Spain.,Departamento de Fisicoquímica, Universidad de Granada (UGR), (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Alba Millán
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | | | - Linda A Zotti
- Departamento de Física Teórica de la Materia Condensada and IFIMAC, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
| | - Delia Miguel
- Departamento de Fisicoquímica, Universidad de Granada (UGR), (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
| | - Juan M Cuerva
- Departamento de Química Orgánica, Universidad de Granada (UGR), Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Facultad de Ciencias, C. U. Fuentenueva, Spain
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