On-surface synthesis and collective spin excitations of a triangulene-based nanostar
arXiv:2107.02198 · doi:10.1002/anie.202108301
Abstract
Triangulene nanographenes are open-shell molecules with predicted high spin state due to the frustration of their conjugated network. Their long-sought synthesis became recently possible over a metal surface. Here, we present a macrocycle formed by six [3]triangulenes, which was obtained by combining the solution synthesis of a dimethylphenyl-anthracene cyclic hexamer and the on-surface cyclodehydrogenation of this precursor over a gold substrate. The resulting triangulene nanostar exhibits a collective spin state generated by the interaction of its 12 unpaired π-electrons along the conjugated lattice, corresponding to the antiferromagnetic ordering of six S = 1 sites (one per triangulene unit). Inelastic electron tunneling spectroscopy resolved three spin excitations connecting the singlet ground state with triplet states. The nanostar behaves close to predictions from the Heisenberg model of a S = 1 spin ring, representing a unique system to test collective spin modes in cyclic systems.
8 pages Ms with 3 figures; 12 pages Supplementary Information
References in corpus (3)
Cited by in corpus (23)
- Observation of fractional edge excitations in nanographene spin chains
- Aza-Triangulene: On-Surface Synthesis, Electronic and Magnetic Properties
- On-surface synthesis and collective spin excitations of a triangulene-based nanostar
- Direct observation of the magnetic ground state of the two smallest triangular nanographenes
- Non-benzenoid high-spin polycyclic hydrocarbons generated by atom manipulation
- On-Surface Synthesis and Characterization of a High-Spin Aza-[5]-Triangulene
- Addressing electron spins embedded in metallic graphene nanoribbons
- Theory of intermolecular exchange in coupled spin-1/2 nanographenes
- Fabrication of Spin-1/2 Heisenberg Antiferromagnetic Chains via Combined On-surface Synthesis and Reduction for Spinon Detection
- Theory of triangulene two-dimensional crystals
- Tuning the Spin Interaction in Non-planar Organic Diradicals Through Mechanical Manipulation
- Broken-symmetry magnetic phases in two-dimensional triangulene crystals
- Conformational tuning of magnetic interactions in coupled nanographenes
- On-surface Synthesis of a Ferromagnetic Molecular Spin Trimer
- Magnetic frustration and fractionalization in oligo(indenoindenes)
- Artificially built Kondo chains with organic radicals on metallic surfaces: new model system of heavy fermion quantum criticality
- Theory of a Single Magnetic Impurity on a Thin Metal Film in Proximity to a Superconductor
- Systematic Modulation of Charge and Spin in Graphene Nanoribbons on MgO
- Designer polyradical nanographenes with strong spin entanglement and perturbation resilience via Clar's goblet extension
- Haldane phases and phase diagrams of the S = 3/2, 1 bilinear-biquadratic Heisenberg model on the orthogonal dimer chain
- Wannier Excitons Confined in Hexagonal Boron Nitride Triangular Quantum Dots
- Identification and optimization of accurate spin models for Fermi-Hubbard ladders using matrix product states
- Quantum Spin-1/2 Rings Built from [2]Triangulene Molecular Units