On‐Surface Synthesis and Collective Spin Excitations of a Triangulene‐Based Nanostar

  title={On‐Surface Synthesis and Collective Spin Excitations of a Triangulene‐Based Nanostar},
  author={Jeremy Hieulle and Silvia Castro and Niklas Friedrich and Alessio Vegliante and Francisco Romero Lara and Sofia Sanz and Dulce Rey and Martina Corso and Thomas Frederiksen and Jos{\'e} Ignacio Pascual and Diego Pe{\~n}a},
  journal={Angewandte Chemie (International Ed. in English)},
  pages={25224 - 25229}
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… 

Figures from this paper

On-surface synthesis of triangulene trimers via dehydration reaction

Triangulene and its homologues are of considerable interest for molecular spintronics due to their high-spin ground states as well as the potential for constructing high spin frameworks. Realizing

Direct observation of the magnetic ground state of the two smallest triangular nanographenes

Fusion of three benzene rings in a triangular fashion gives rise to the smallest open-shell graphene fragment, the phenalenyl radical, whose π -extension leads to an entire family of non-Kekulé

Theory of triangulene two-dimensional crystals

Equilateral triangle-shaped graphene nanoislands with a lateral dimension of n benzene rings are known as [n] triangulenes. Individual [n] triangulenes are open-shell molecules, with single-particle

Nonbenzenoid High-Spin Polycyclic Hydrocarbons Generated by Atom Manipulation.

We report the on-surface synthesis of a nonbenzenoid triradical through dehydrogenation of truxene (C27H18) on coinage metal and insulator surfaces. Voltage pulses applied via the tip of a combined

On-surface synthesis and spontaneous segregation of conjugated tetraphenylethylene macrocycles

Creating conjugated macrocycles has attracted extensive research interest because their unique chemical and physical properties, such as conformational flexibility, intrinsic inner cavities and

Magnetic frustration and fractionalization in oligo(indenoindenes)

Poly(indenoindenes) are π -conjugated ladder carbon polymers with alternating hexagons and pentagons hosting one unpaired electron for each five-membered ring in the open-shell limit. Here we study

Carbon-based nanostructures as a versatile platform for tunable π-magnetism

Emergence of π-magnetism in open-shell nanographenes has been theoretically predicted decades ago but their experimental characterization was elusive due to the strong chemical reactivity that makes

Addressing Electron Spins Embedded in Metallic Graphene Nanoribbons

Spin-hosting graphene nanostructures are promising metal-free systems for elementary quantum spintronic devices. Conventionally, spins are protected from quenching by electronic band gaps, which also

Spin State Switching in Heptauthrene Nanostructure by Electric Field: Computational Study

  • K. Szałowski
  • Physics
    International journal of molecular sciences
  • 2021
The computational study predicting the possibility of controlling this triplet spin state in atomically precise heptauthrene nanostructure with an external in-plane electric field by causing the spin switching is reported.

Organic Higher-Order Topological Insulators: Heterotriangulene-Based Covalent Organic Frameworks.

The ability to design and control the chemical characteristics of covalent organic frameworks (COFs) offers a new avenue for the development of functional materials, especially with respect to



Collective All‐Carbon Magnetism in Triangulene Dimers†

The on‐surface synthesis and a proof‐of‐principle experimental study of magnetism in covalently bonded triangulene dimers are presented and collective singlet–triplet spin excitations in the dimers revealed, demonstrating efficient intertriangulenes magnetic coupling.

Synthesis and Characterization of π-Extended Triangulene.

This work reports a combined in-solution and on-surface synthesis of π-extended triangulene, a non-Kekulé nanographene with the structural formula C33H15, consisting of ten benzene rings fused in a triangular fashion, potentially useful in carbon-based spintronics.

Atomically precise bottom-up synthesis of π-extended [5]triangulene

The bottom-up synthesis of π-extended triangulene is reported with atomic precision via surface-assisted cyclodehydrogenation of a rationally designed molecular precursor on metallic surfaces, and results show that [5]triangulenes synthesized on Au(111) retain the open-shell ρ-conjugated character with magnetic ground states.

Synthesis and characterization of triangulene.

The on-surface generation of unsubstituted triangulene that consists of six fused benzene rings is shown, rendering manifold experiments possible to investigate triangULene and related open-shell fragments at the single-molecule level.

Single spin localization and manipulation in graphene open-shell nanostructures

The discovery of unpaired electron spins localized in certain sites of graphene nanoribbons, and the measurement of their coupling by inducing singlet-triplet excitations with a scanning tunneling microscope, demonstrates the intrinsic π-paramagnetism of graphenenanostructures.

Topological frustration induces unconventional magnetism in a nanographene

The results provide direct evidence of carbon magnetism in a hitherto unrealized class of nanographenes, and prove a long-predicted paradigm where topological frustration entails unconventional magnetism, with implications for room-temperature carbon-based spintronics.

Synthetic Tailoring of Graphene Nanostructures with Zigzag‐Edged Topologies: Progress and Perspectives

The recent progress in the controlled synthesis of zigzag‐edged graphene nanostructures with different topologies through a bottom‐up synthetic strategy is discussed.

Graphene nanoFlakes with large spin.

The principle of topological frustration can be used to introduce large net spin and interesting spin distributions in graphene and suggest an avenue to nanoscale spintronics through the sculpting of graphene fragments.