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Diradical Organic One-Dimensional Polymers Synthesized on a Metallic Surface |
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| Authors: | Ana Sánchez-Grande Dr. José I. Urgel Aleš Cahlík Dr. José Santos Shayan Edalatmanesh Eider Rodríguez-Sánchez Dr. Koen Lauwaet Dr. Pingo Mutombo Prof. Dana Nachtigallová Reed Nieman Prof. Hans Lischka Dr. Bruno de la Torre Prof. Rodolfo Miranda Dr. Oliver Gröning Prof. Nazario Martín Prof. Pavel Jelínek Prof. David Écija |
| Affiliation: | 1. IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049 Madrid, Spain;2. Institute of Physics of the Czech Academy of Science, 16253 Praha, Czech Republic Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, 77146 Olomouc, Czech Republic;3. IMDEA Nanoscience, C/ Faraday 9, Campus de Cantoblanco, 28049 Madrid, Spain Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain;4. Institute of Physics of the Czech Academy of Science, 16253 Praha, Czech Republic;5. Regional Centre of Advanced Technologies and Materials, Palacký University Olomouc, 77146 Olomouc, Czech Republic Institute of Organic Chemistry and Biochemistry of the Czech Academy of Science, 16000 Praha, Czech Republic;6. Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, 79409 USA;7. Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, 79409 USA School of Pharmaceutical Sciences and Technology, Tianjin University, Tianjin, 300072 P. R. China;8. 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;9. Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 Dübendorf, Switzerland |
| Abstract: | We report on the synthesis and characterization of atomically precise one-dimensional diradical peripentacene polymers on a Au(111) surface. By means of high-resolution scanning probe microscopy complemented by theoretical simulations, we provide evidence of their magnetic properties, which arise from the presence of two unpaired spins at their termini. Additionally, we probe a transition of their magnetic properties related to the length of the polymer. Peripentacene dimers exhibit an antiferromagnetic (S=0) singlet ground state. They are characterized by singlet–triplet spin-flip inelastic excitations with an effective exchange coupling (Jeff) of 2.5 meV, whereas trimers and longer peripentacene polymers reveal a paramagnetic nature and feature Kondo fingerprints at each terminus due to the unpaired spin. Our work provides access to the precise fabrication of polymers featuring diradical character which are potentially useful in carbon-based optoelectronics and spintronics. |
| Keywords: | cumulenes diradical polymers nc-AFM scanning tunneling microscopy surface chemistry |