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<p>We present an efficient strategy for on-surface engineering of organic metal-free supramolecular complexes with long-term spin protection. By vacuum deposition of azafullerene (C<sub>59</sub>N<sup>•</sup>) monomers on a pre-deposited template layer of [10]cycloparaphenylene ([10]CPP) nanohoops on Au(111) surface we exploit the molecular shape matching between the C<sub>59</sub>N<sup>•</sup> and [10]CPP for the azafullerene encapsulation with nanohoops in a guest-host complexation geometry. C<sub>59</sub>N<sup>•</sup>⊂[10]CPP supramolecular complexes self-assemble into an extended two-dimensional hexagonal lattice yielding a high density network of stable spin-1/2 radicals. We find compelling evidence for electronic coupling between the guest C<sub>59</sub>N<sup>•</sup> and the host [10]CPP in supramolecular species. At the same time, [10]CPP effectively protects the radical state of encapsulated azafullerenes against dimerization and inhibits C<sub>59</sub>N<sup>•</sup> coupling to the Au substrate. Azafullerene encapsulation by nanohoops represents a viable realization of molecular spin protection while simultaneously demonstrating exceptional self-assembling properties by which large-scale 2D architectures of molecular spins can be realized.</p>

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Engineering 2D spin networks by on-surface encapsulation of azafullerene radicals in nanotemplates

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月2日

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  • Gregor Kladnik,
  • Luca Schio,
  • Gregor Bavdek,
  • Yuri Tanuma,
  • Marion van Midden Mavrič,
  • Erik Zupanič,
  • Bastien Anézo,
  • Ioanna K. Sideri,
  • Nikos Tagmatarchis,
  • Jannis Volkmann,
  • Hermann A. Wegner,
  • Andrea Goldoni,
  • Christopher P. Ewels,
  • Alberto Morgante,
  • Luca Floreano,
  • Denis Arčon,
  • Dean Cvetko

摘要

We present an efficient strategy for on-surface engineering of organic metal-free supramolecular complexes with long-term spin protection. By vacuum deposition of azafullerene (C59N•) monomers on a pre-deposited template layer of [10]cycloparaphenylene ([10]CPP) nanohoops on Au(111) surface we exploit the molecular shape matching between the C59N• and [10]CPP for the azafullerene encapsulation with nanohoops in a guest-host complexation geometry. C59N•⊂[10]CPP supramolecular complexes self-assemble into an extended two-dimensional hexagonal lattice yielding a high density network of stable spin-1/2 radicals. We find compelling evidence for electronic coupling between the guest C59N• and the host [10]CPP in supramolecular species. At the same time, [10]CPP effectively protects the radical state of encapsulated azafullerenes against dimerization and inhibits C59N• coupling to the Au substrate. Azafullerene encapsulation by nanohoops represents a viable realization of molecular spin protection while simultaneously demonstrating exceptional self-assembling properties by which large-scale 2D architectures of molecular spins can be realized.