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Diradical Organic One‐Dimensional Polymers Synthesized on a Metallic Surface
Author(s) -
SánchezGrande Ana,
Urgel José I.,
Cahlík Aleš,
Santos José,
Edalatmanesh Shayan,
RodríguezSánchez Eider,
Lauwaet Koen,
Mutombo Pingo,
Nachtigallová Dana,
Nieman Reed,
Lischka Hans,
Torre Bruno,
Miranda Rodolfo,
Gröning Oliver,
Martín Nazario,
Jelínek Pavel,
Écija David
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202006276
Subject(s) - diradical , spintronics , unpaired electron , singlet state , polymer , paramagnetism , antiferromagnetism , materials science , spins , chemical physics , spin (aerodynamics) , condensed matter physics , chemistry , nanotechnology , physics , molecule , ferromagnetism , atomic physics , excited state , organic chemistry , composite material , thermodynamics
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 ( J eff ) 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.