Features of Exchange Interaction Between Cr3+ Ions in Compounds [Fe(phen)3][Cr2(OH)(Ac)(nta)2]·6,25H2O and [Fe(bpy)3][Cr2(OH)(Ac)(nta)2]·8H2O
- Authors: Mingalieva L.V.1, Galeev R.T.1, Sukhanov A.A.1, Voronkova V.K.1, Budnikova I.K.2, Novitchi G.3
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Affiliations:
- Zavoisky Physical-Technical Institute, Russian Academy of Sciences
- Kazan State Power Engineering University
- LNCMI, CNRS, UPR 3228
- Issue: Vol 49, No 1 (2018)
- Pages: 61-69
- Section: Original Paper
- URL: https://journals.rcsi.science/0937-9347/article/view/247930
- DOI: https://doi.org/10.1007/s00723-017-0937-2
- ID: 247930
Cite item
Abstract
Dimers of Cr3+ ions in compounds [Fe(phen)3][Cr2(OH)(Ac)(nta)2]·6,25H2O (I) and [Fe(bpy)3][Cr2(OH)(Ac)(nta)2]·8H2O (II), temperature dependences of the electron paramagnetic resonance (EPR) spectra of which in the range of 300–12 К are characteristic for dimers with strong antiferromagnetic exchange interaction are studied by the EPR method in the X-band. The anisotropy of the spin–spin interaction is estimated from fitting spectra corresponding to the multiplet with S = 2 to model spectra. It is shown that the tensor of the anisotropic spin–spin interaction considerably differs from that of the dipole–dipole contribution. Signals from the multiplet with S = 1 were also separated for the compound II that made it possible to estimate the fine structure parameter of the Cr3+ ion. Features of the variation of the integral intensity of EPR spectra are observed at temperatures below 6 К for I and 7 К for II, which are explained by the decrease in the value of the isotropic exchange between chromium ions in dimers. Only the intensity of spectrum changes and its shape is completely preserved.
About the authors
L. V. Mingalieva
Zavoisky Physical-Technical Institute, Russian Academy of Sciences
Email: vio@kfti.knc.ru
Russian Federation, Sibirsky Tract 10/7, Kazan, 420029
R. T. Galeev
Zavoisky Physical-Technical Institute, Russian Academy of Sciences
Email: vio@kfti.knc.ru
Russian Federation, Sibirsky Tract 10/7, Kazan, 420029
A. A. Sukhanov
Zavoisky Physical-Technical Institute, Russian Academy of Sciences
Email: vio@kfti.knc.ru
Russian Federation, Sibirsky Tract 10/7, Kazan, 420029
V. K. Voronkova
Zavoisky Physical-Technical Institute, Russian Academy of Sciences
Author for correspondence.
Email: vio@kfti.knc.ru
ORCID iD: 0000-0001-6883-3306
Russian Federation, Sibirsky Tract 10/7, Kazan, 420029
I. K. Budnikova
Kazan State Power Engineering University
Email: vio@kfti.knc.ru
Russian Federation, Kazan, 420066
G. Novitchi
LNCMI, CNRS, UPR 3228
Email: vio@kfti.knc.ru
France, 25 rue des Martyrs, B.P. 166, Grenoble Cedex 9, 38042