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

A series of heterometallic [Ti IV 7 M III ] rings are reported which contain a single paramagnetic metal centre, either Fe III or Cr III . 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,...

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Vydané v:Applied magnetic resonance Ročník 51; číslo 11; s. 1251 - 1265
Hlavní autori: Kostopoulos, Andreas K., Timco, Grigore A., Tuna, Floriana, Vitórica-Yrezábal, Iñigo J., Whitehead, George F. S., Bamberger, Heiko, van Slageren, Joris, Collison, David, McInnes, Eric J. L., Winpenny, Richard E. P.
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Vienna Springer Vienna 01.11.2020
Springer Nature B.V
Predmet:
Acids
Anisotropy
Atoms and Molecules in Strong Fields
Cations
Cesium
Dante Gatteschi: On the Occasion of His 75th Birthday
Laser Matter Interaction
Organic Chemistry
Original Paper
Physical Chemistry
Physics
Physics and Astronomy
Radiation
Sensors
Single crystals
Solid State Physics
Solvents
Spectroscopy/Spectrometry
Spectrum analysis
Titanium
ISSN:0937-9347, 1613-7507
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Popis
Shrnutí:A series of heterometallic [Ti IV 7 M III ] rings are reported which contain a single paramagnetic metal centre, either Fe III or Cr III . 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 Fe III sites have rhombic anisotropy, with D around − 0.18 cm −1 and λ (=  D/E ) approximately 0.25. The Cr III 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.
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ISSN:0937-9347
1613-7507
DOI:10.1007/s00723-020-01285-z