Diradical Organic One-Dimensional Polymers Synthesized on a Metallic Surface

Ana Sánchez-Grande, José I. Urgel, Aleš Cahlík, José Santos, Shayan Edalatmanesh, Eider Rodríguez-Sánchez, Koen Lauwaet, Pingo Mutombo, Dana Nachtigallová, Reed Nieman, Hans Lischka, Bruno de la Torre, Rodolfo Miranda, Oliver Gröning, Nazario Martín, Pavel Jelínek, David Écija

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

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.

Original languageEnglish
Pages (from-to)17594-17599
Number of pages6
JournalAngewandte Chemie - International Edition
Volume59
Issue number40
DOIs
StatePublished - Sep 28 2020

Keywords

  • cumulenes
  • diradical polymers
  • nc-AFM
  • scanning tunneling microscopy
  • surface chemistry

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