Single Ion Anisotropy of CrIII and FeIII in a Series of {Ti7M} Rings

Andreas K. Kostopoulos, Grigore A. Timco, Floriana Tuna, Iñigo J. Vitórica-yrezábal, George F. S. Whitehead, Heiko Bamberger, Joris Van Slageren, David Collison, Eric J. L. Mcinnes, Richard E. P. Winpenny

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A series of heterometallic [TiIV7MIII] rings are reported which contain a single paramagnetic metal centre, either FeIII or CrIII. The structures contain an octagon of metals bridged by oxides within the ring and pivalate ligands outside the ring. The structures encapsulate a single cation, either a secondary ammonium cation or a cesium. Multi-frequency EPR spectroscopy was used to measure the zero-field splitting parameters for the paramagnetic metal sites. The FeIII sites have rhombic anisotropy, with D around − 0.18 cm−1 and λ (= D/E) approximately 0.25. The CrIII have a more axial anisotropy, with D around − 0.5 cm−1 and λ around 0.05. Attempts to find a magneto-structural correlation are vitiated by the difficulty of refining the challenging crystal structures.
Original languageEnglish
Pages (from-to)1251-1265
JournalApplied Magnetic Resonance
Issue number11
Early online date30 Oct 2020
Publication statusPublished - 1 Nov 2020


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