Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction

M. Lengen; E. Bill; C. Butzlaff; A. X. Trautwein; M. Winter; P. Chaudhuri

doi:10.1007/BF02063706

Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction

M. Lengen^*, E. Bill, C. Butzlaff, A. X. Trautwein, M. Winter, P. Chaudhuri

^*Corresponding author for this work

Institute of Physics

Ruhr-University Bochum

3 Citations (Scopus)

Abstract

The magnetic properties of [L-Fe(III)-dmg₃Mn(II)-Fe(III)-L] (ClO₄)₂ have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distances d_Fe-Mn=0.35 nm and d_Fe-Fe=0.7 nm. Magnetic susceptibility measurements (3-295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=J_Fe-Mn(S_Fe1+S_Fe2)S_Mn +J_Fe-Fe(S_Fe1S_Fe2) +gΜ_BS_totalB. The spins S_Fe1=S_Fe2 =S_Mn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin of S_total=5/2 with exchange coupling constants F_Fe-Mn=13.4 cm^-1 and J_Fe-Fe= 4.5 cm^-1. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 m T, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling with A_total/(g_NΜ_N)=-18.5 T. The corresponding local component A_Fe is related to A_total via spin-projection:A_total=(6/7)A_Fe. The resulting A_Fe/(g_NΜ_N)=-21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies.

Original language	English
Journal	Hyperfine Interactions
Volume	94
Issue number	1
Pages (from-to)	1849-1853
Number of pages	5
ISSN	0304-3834
DOIs	https://doi.org/10.1007/BF02063706
Publication status	Published - 01.12.1994

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@article{ff673b33c68d4bbeafec23b54196b6e7,

title = "Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction",

abstract = "The magnetic properties of [L-Fe(III)-dmg3Mn(II)-Fe(III)-L] (ClO4)2 have been characterized by magnetic susceptibility, EPR, and M{\"o}ssbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distances dFe-Mn=0.35 nm and dFe-Fe=0.7 nm. Magnetic susceptibility measurements (3-295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +gΜBStotalB. The spins SFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin of Stotal=5/2 with exchange coupling constants FFe-Mn=13.4 cm-1 and JFe-Fe= 4.5 cm-1. Magnetically split M{\"o}ssbauer spectra were recorded at 1.5 K under various applied fields (20 m T, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling with Atotal/(gNΜN)=-18.5 T. The corresponding local component AFe is related to Atotal via spin-projection:Atotal=(6/7)AFe. The resulting AFe/(gNΜN)=-21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from M{\"o}ssbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies.",

author = "M. Lengen and E. Bill and C. Butzlaff and Trautwein, \{A. X.\} and M. Winter and P. Chaudhuri",

year = "1994",

month = dec,

day = "1",

doi = "10.1007/BF02063706",

language = "English",

volume = "94",

pages = "1849--1853",

journal = "Hyperfine Interactions",

issn = "0304-3834",

publisher = "Springer Nature",

number = "1",

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TY - JOUR

T1 - Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction

AU - Lengen, M.

AU - Bill, E.

AU - Butzlaff, C.

AU - Trautwein, A. X.

AU - Winter, M.

AU - Chaudhuri, P.

PY - 1994/12/1

Y1 - 1994/12/1

N2 - The magnetic properties of [L-Fe(III)-dmg3Mn(II)-Fe(III)-L] (ClO4)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distances dFe-Mn=0.35 nm and dFe-Fe=0.7 nm. Magnetic susceptibility measurements (3-295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +gΜBStotalB. The spins SFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin of Stotal=5/2 with exchange coupling constants FFe-Mn=13.4 cm-1 and JFe-Fe= 4.5 cm-1. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 m T, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling with Atotal/(gNΜN)=-18.5 T. The corresponding local component AFe is related to Atotal via spin-projection:Atotal=(6/7)AFe. The resulting AFe/(gNΜN)=-21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies.

AB - The magnetic properties of [L-Fe(III)-dmg3Mn(II)-Fe(III)-L] (ClO4)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distances dFe-Mn=0.35 nm and dFe-Fe=0.7 nm. Magnetic susceptibility measurements (3-295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +gΜBStotalB. The spins SFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin of Stotal=5/2 with exchange coupling constants FFe-Mn=13.4 cm-1 and JFe-Fe= 4.5 cm-1. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 m T, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling with Atotal/(gNΜN)=-18.5 T. The corresponding local component AFe is related to Atotal via spin-projection:Atotal=(6/7)AFe. The resulting AFe/(gNΜN)=-21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies.

UR - https://www.scopus.com/pages/publications/0141893308

U2 - 10.1007/BF02063706

DO - 10.1007/BF02063706

M3 - Journal articles

AN - SCOPUS:0141893308

SN - 0304-3834

VL - 94

SP - 1849

EP - 1853

JO - Hyperfine Interactions

JF - Hyperfine Interactions

IS - 1

ER -

Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction

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