Weak Exchange Interactions in Multispin Systems: EPR Studies of Metalloporphyrins Decorated with {Cr7Ni} Rings

Fabio Santanni, Edmund Little, Selena Lockyer, George Whitehead, Eric Mcinnes, Grigore Timco, Alice Bowen, Roberta Sessoli, Richard Winpenny

Research output: Contribution to journalArticlepeer-review

Abstract

Both metalloporphyrins and heterometallic {Cr7Ni} rings are of significant research interest due to their proposed roles in quantum information processing devices. In this study, we present a series of complexes in which [Cr7NiF3(Etglu)(O2CtBu)15] (N-EtgluH5 = N-ethyl-D-glucamine) heterometallic rings are coordinated to metalloporphyrin linkers: the symmetric [M(TPyP)] for M= Cu2+, VO2+ and H2TPyP = 5,10,15,20-tetra(4-pyridyl)porphyrin; and the asymmetric [{VO}(TrPPyP)] for H2(TrPPyP) = 5,10,15-(triphenyl)-20-(4-pyridyl)porphyrin. The magnetic interactions present in these complexes are unraveled using the continuous wave (CW) Electron Paramagnetic Resonance (EPR) technique. The nature of the coupling between the {Cr7Ni} rings and the central metalloporphyrin is assessed by numerical simulations of CW EPR spectra and determined to be on the order of 0.01 cm-1, larger than the dipolar ones and suitable for individual spin addressability in multi-qubit architectures.
Original languageEnglish
JournalInorganic Chemistry
Publication statusAccepted/In press - 10 Jun 2024

Keywords

  • Porphyrin chemistry
  • Macromolecular systems
  • Molecular magnetism
  • EPR spectroscopy

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