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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2002     Display Documents

ID: 7592.0, MPI für Festkörperforschung / FKF Publikationen 2002
Magnetic anisotropy of the antiferromagnetic ring [Cr8F8PiV16]
Authors:van Slageren, J.; Sessoli, R.; Gatteschi, D.; Smith, A. A.; Helliwell, M.; Winpenny, R. E. P.; Cornia, A.; Barra, A. L.; Jansen, A. G. M.; Rentschler, E.; Timco, G. A.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Chemistry - A European Journal
Issue / Number:1
Start Page:277
End Page:285
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:A new tetragonal (P42(1)2) crystalline form of
[Cr(8)F(8)Piv(16)] (HPiv = pivalic acid, trimethyl acetic acid)
is reported. The ring-shaped molecules, which are aligned in a
parallel fashion in the unit cell, form almost perfectly
planar, regular octagons. The interaction between the Cr-III
ions is antiferromagnetic (J = 12 cm(-1)) which results in a S
= 0 spin ground state, The low-lying spin excited states were
investigated by cantilever torque magnetometry (CTM) and high-
frequency EPR (HFEPR). The compound shows hard-axis anisotropy.
The axial zero-field splitting (ZFS) parameters of the first
two spin excited states (S = 1 and S = 2, respectively) are D-1
= 1.59(3) cm(-1) or 1.63 cm(-1) (from CTM and HFEPR,
respectively) and D-2 0.37 cm(-1) (from HFEPR). The dipolar
contributions to the ZFS of the S = 1 and S = 2 spin states
were calculated with the point dipolar approximation. These
contributions proved to be less than the combined single-ion
contributions. Angular overlap model calculations that used
parameters obtained from the electronic absorption spectrum,
showed that the unique axis of the single-ion ZFS is at an
angle of 19.3(1)degrees with respect to the ring axis. The
excellent agreement between the experimental and the
theoretical results show the validity of the used methods for
the analysis of the magnetic anisotropy in antiferromagnetic
Cr-III rings.
Free Keywords:antiferromagnetic rings; cantilever torque magnetometry;
chromium; high-field high-frequency EPR spectroscopy; magnetic
anisotropy; molecular magnets
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Univ Florence, Dept Chim, Via Lastruccia 3, I-50019 Sesto Fiorentino, Italy
; INSTM Firenze, UdR, I-50019 Sesto Fiorentino, Italy
; Univ Manchester, Dept Chem, Manchester M13 9PL, Lancs, England
; Univ Modena, Dipartimento Chim, I-41100 Modena, Italy
; Max Planck Inst Festkorperforsch, Grenoble High Magnet Field Lab, F-38042 Grenoble 9, France
; CNRS, F-38042 Grenoble 9, France
; Max Planck Inst Strahlenchem, D-45470 Mulheim, Germany
; Acad Sci Republ Moldova, Inst Chem, Kishinev 2028, Moldova
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