Measurement of the Quantum Tunnelling Gap in a Dysprosocenium Single-Molecule Magnet

William J. A. Blackmore, Andrea Mattioni, Sophie C. Corner, Peter Evans, Gemma K. Gransbury, David P. Mills, Nicholas F. Chilton

Research output: Contribution to journalArticlepeer-review


We perform magnetisation sweeps on the high-performing single-molecule magnet
[Dy(Cpttt)2][B(C6F5)4] (Cpttt = C5H t
2 Bu3-1,2,4; tBu = C(CH3)3) to determine the
quantum tunnelling gap of the ground-state avoided crossing at zero-field, finding a
value on the order of 10−7 cm−1. In addition to the pure crystalline material, we also
measure the tunnel splitting of [Dy(Cpttt)2][B(C6F5)4] dissolved in dichloromethane
(DCM) and 1,2-difluorobenzene (DFB). We find that concentrations of 200 or 100 mM
[Dy(Cpttt)2][B(C6F5)4] in these solvents increases the size of the tunnelling gap compared
to the pure sample, despite a similarity in the strength of the dipolar fields,
indicating that either a structural or vibrational change due to the environment increases
quantum tunnelling rates.
Original languageEnglish
JournalJournal of Physical Chemistry Letters
Publication statusAccepted/In press - 13 Feb 2023


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