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)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield...
Ausführliche Beschreibung
Autor*in: |
Lengen, M. [verfasserIn] |
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Artikel |
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Sprache: |
Englisch |
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1994 |
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Anmerkung: |
© J.C. Baltzer AG, Science Publishers 1994 |
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Übergeordnetes Werk: |
Enthalten in: Hyperfine interactions - Baltzer Science Publishers, Baarn/Kluwer Academic Publishers, 1975, 94(1994), 1 vom: Dez., Seite 1849-1853 |
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Übergeordnetes Werk: |
volume:94 ; year:1994 ; number:1 ; month:12 ; pages:1849-1853 |
Links: |
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DOI / URN: |
10.1007/BF02063706 |
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Katalog-ID: |
OLC207638331X |
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245 | 1 | 0 | |a Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction |
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520 | |a Abstract The magnetic properties of [L-Fe(III)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distancesdFe-Mn=0.35 nm anddFe-Fe=0.7 nm. Magnetic susceptibility measurements (3–295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +$ gΜ_{B} $StotalB. The spinsSFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin ofStotal=5/2 with exchange coupling constantsFFe-Mn=13.4 $ cm^{−1} $ andJFe-Fe= 4.5 $ cm^{−1} $. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 mT, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling withAtotal/(gNΜN)=−18.5 T. The corresponding local componentAFe is related toAtotal via spin-projection:Atotal=(6/7)$ A_{Fe} $. The resultingAFe/(gN$ Μ_{N} $)=−21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies. | ||
650 | 4 | |a Magnetic Susceptibility | |
650 | 4 | |a Exchange Coupling | |
650 | 4 | |a Hyperfine Coupling | |
650 | 4 | |a Magnetic Susceptibility Measurement | |
650 | 4 | |a Magnetic Hyperfine | |
700 | 1 | |a Bill, E. |4 aut | |
700 | 1 | |a Butzlaff, C. |4 aut | |
700 | 1 | |a Trautwein, A. X. |4 aut | |
700 | 1 | |a Winter, M. |4 aut | |
700 | 1 | |a Chaudhuri, P. |4 aut | |
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10.1007/BF02063706 doi (DE-627)OLC207638331X (DE-He213)BF02063706-p DE-627 ger DE-627 rakwb eng 530 VZ 33.00 bkl Lengen, M. verfasserin aut Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © J.C. Baltzer AG, Science Publishers 1994 Abstract The magnetic properties of [L-Fe(III)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distancesdFe-Mn=0.35 nm anddFe-Fe=0.7 nm. Magnetic susceptibility measurements (3–295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +$ gΜ_{B} $StotalB. The spinsSFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin ofStotal=5/2 with exchange coupling constantsFFe-Mn=13.4 $ cm^{−1} $ andJFe-Fe= 4.5 $ cm^{−1} $. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 mT, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling withAtotal/(gNΜN)=−18.5 T. The corresponding local componentAFe is related toAtotal via spin-projection:Atotal=(6/7)$ A_{Fe} $. The resultingAFe/(gN$ Μ_{N} $)=−21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies. Magnetic Susceptibility Exchange Coupling Hyperfine Coupling Magnetic Susceptibility Measurement Magnetic Hyperfine Bill, E. aut Butzlaff, C. aut Trautwein, A. X. aut Winter, M. aut Chaudhuri, P. aut Enthalten in Hyperfine interactions Baltzer Science Publishers, Baarn/Kluwer Academic Publishers, 1975 94(1994), 1 vom: Dez., Seite 1849-1853 (DE-627)129438685 (DE-600)194471-X (DE-576)014809028 0304-3843 nnns volume:94 year:1994 number:1 month:12 pages:1849-1853 https://doi.org/10.1007/BF02063706 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 33.00 VZ AR 94 1994 1 12 1849-1853 |
spelling |
10.1007/BF02063706 doi (DE-627)OLC207638331X (DE-He213)BF02063706-p DE-627 ger DE-627 rakwb eng 530 VZ 33.00 bkl Lengen, M. verfasserin aut Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © J.C. Baltzer AG, Science Publishers 1994 Abstract The magnetic properties of [L-Fe(III)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distancesdFe-Mn=0.35 nm anddFe-Fe=0.7 nm. Magnetic susceptibility measurements (3–295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +$ gΜ_{B} $StotalB. The spinsSFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin ofStotal=5/2 with exchange coupling constantsFFe-Mn=13.4 $ cm^{−1} $ andJFe-Fe= 4.5 $ cm^{−1} $. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 mT, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling withAtotal/(gNΜN)=−18.5 T. The corresponding local componentAFe is related toAtotal via spin-projection:Atotal=(6/7)$ A_{Fe} $. The resultingAFe/(gN$ Μ_{N} $)=−21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies. Magnetic Susceptibility Exchange Coupling Hyperfine Coupling Magnetic Susceptibility Measurement Magnetic Hyperfine Bill, E. aut Butzlaff, C. aut Trautwein, A. X. aut Winter, M. aut Chaudhuri, P. aut Enthalten in Hyperfine interactions Baltzer Science Publishers, Baarn/Kluwer Academic Publishers, 1975 94(1994), 1 vom: Dez., Seite 1849-1853 (DE-627)129438685 (DE-600)194471-X (DE-576)014809028 0304-3843 nnns volume:94 year:1994 number:1 month:12 pages:1849-1853 https://doi.org/10.1007/BF02063706 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 33.00 VZ AR 94 1994 1 12 1849-1853 |
allfields_unstemmed |
10.1007/BF02063706 doi (DE-627)OLC207638331X (DE-He213)BF02063706-p DE-627 ger DE-627 rakwb eng 530 VZ 33.00 bkl Lengen, M. verfasserin aut Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © J.C. Baltzer AG, Science Publishers 1994 Abstract The magnetic properties of [L-Fe(III)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distancesdFe-Mn=0.35 nm anddFe-Fe=0.7 nm. Magnetic susceptibility measurements (3–295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +$ gΜ_{B} $StotalB. The spinsSFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin ofStotal=5/2 with exchange coupling constantsFFe-Mn=13.4 $ cm^{−1} $ andJFe-Fe= 4.5 $ cm^{−1} $. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 mT, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling withAtotal/(gNΜN)=−18.5 T. The corresponding local componentAFe is related toAtotal via spin-projection:Atotal=(6/7)$ A_{Fe} $. The resultingAFe/(gN$ Μ_{N} $)=−21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies. Magnetic Susceptibility Exchange Coupling Hyperfine Coupling Magnetic Susceptibility Measurement Magnetic Hyperfine Bill, E. aut Butzlaff, C. aut Trautwein, A. X. aut Winter, M. aut Chaudhuri, P. aut Enthalten in Hyperfine interactions Baltzer Science Publishers, Baarn/Kluwer Academic Publishers, 1975 94(1994), 1 vom: Dez., Seite 1849-1853 (DE-627)129438685 (DE-600)194471-X (DE-576)014809028 0304-3843 nnns volume:94 year:1994 number:1 month:12 pages:1849-1853 https://doi.org/10.1007/BF02063706 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 33.00 VZ AR 94 1994 1 12 1849-1853 |
allfieldsGer |
10.1007/BF02063706 doi (DE-627)OLC207638331X (DE-He213)BF02063706-p DE-627 ger DE-627 rakwb eng 530 VZ 33.00 bkl Lengen, M. verfasserin aut Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © J.C. Baltzer AG, Science Publishers 1994 Abstract The magnetic properties of [L-Fe(III)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distancesdFe-Mn=0.35 nm anddFe-Fe=0.7 nm. Magnetic susceptibility measurements (3–295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +$ gΜ_{B} $StotalB. The spinsSFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin ofStotal=5/2 with exchange coupling constantsFFe-Mn=13.4 $ cm^{−1} $ andJFe-Fe= 4.5 $ cm^{−1} $. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 mT, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling withAtotal/(gNΜN)=−18.5 T. The corresponding local componentAFe is related toAtotal via spin-projection:Atotal=(6/7)$ A_{Fe} $. The resultingAFe/(gN$ Μ_{N} $)=−21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies. Magnetic Susceptibility Exchange Coupling Hyperfine Coupling Magnetic Susceptibility Measurement Magnetic Hyperfine Bill, E. aut Butzlaff, C. aut Trautwein, A. X. aut Winter, M. aut Chaudhuri, P. aut Enthalten in Hyperfine interactions Baltzer Science Publishers, Baarn/Kluwer Academic Publishers, 1975 94(1994), 1 vom: Dez., Seite 1849-1853 (DE-627)129438685 (DE-600)194471-X (DE-576)014809028 0304-3843 nnns volume:94 year:1994 number:1 month:12 pages:1849-1853 https://doi.org/10.1007/BF02063706 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 33.00 VZ AR 94 1994 1 12 1849-1853 |
allfieldsSound |
10.1007/BF02063706 doi (DE-627)OLC207638331X (DE-He213)BF02063706-p DE-627 ger DE-627 rakwb eng 530 VZ 33.00 bkl Lengen, M. verfasserin aut Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction 1994 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © J.C. Baltzer AG, Science Publishers 1994 Abstract The magnetic properties of [L-Fe(III)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distancesdFe-Mn=0.35 nm anddFe-Fe=0.7 nm. Magnetic susceptibility measurements (3–295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +$ gΜ_{B} $StotalB. The spinsSFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin ofStotal=5/2 with exchange coupling constantsFFe-Mn=13.4 $ cm^{−1} $ andJFe-Fe= 4.5 $ cm^{−1} $. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 mT, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling withAtotal/(gNΜN)=−18.5 T. The corresponding local componentAFe is related toAtotal via spin-projection:Atotal=(6/7)$ A_{Fe} $. The resultingAFe/(gN$ Μ_{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. Magnetic Susceptibility Exchange Coupling Hyperfine Coupling Magnetic Susceptibility Measurement Magnetic Hyperfine Bill, E. aut Butzlaff, C. aut Trautwein, A. X. aut Winter, M. aut Chaudhuri, P. aut Enthalten in Hyperfine interactions Baltzer Science Publishers, Baarn/Kluwer Academic Publishers, 1975 94(1994), 1 vom: Dez., Seite 1849-1853 (DE-627)129438685 (DE-600)194471-X (DE-576)014809028 0304-3843 nnns volume:94 year:1994 number:1 month:12 pages:1849-1853 https://doi.org/10.1007/BF02063706 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-PHY GBV_ILN_20 GBV_ILN_22 GBV_ILN_40 GBV_ILN_70 GBV_ILN_2279 GBV_ILN_4012 GBV_ILN_4046 33.00 VZ AR 94 1994 1 12 1849-1853 |
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English |
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Enthalten in Hyperfine interactions 94(1994), 1 vom: Dez., Seite 1849-1853 volume:94 year:1994 number:1 month:12 pages:1849-1853 |
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Enthalten in Hyperfine interactions 94(1994), 1 vom: Dez., Seite 1849-1853 volume:94 year:1994 number:1 month:12 pages:1849-1853 |
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Lengen, M. ddc 530 bkl 33.00 misc Magnetic Susceptibility misc Exchange Coupling misc Hyperfine Coupling misc Magnetic Susceptibility Measurement misc Magnetic Hyperfine Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction |
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530 VZ 33.00 bkl Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction Magnetic Susceptibility Exchange Coupling Hyperfine Coupling Magnetic Susceptibility Measurement Magnetic Hyperfine |
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Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction |
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molecular magnetism of a linear fe(iii)-mn(ii)-fe(iii) complex. influence of long-range exchange interaction |
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Molecular magnetism of a linear Fe(III)-Mn(II)-Fe(III) complex. Influence of long-range exchange interaction |
abstract |
Abstract The magnetic properties of [L-Fe(III)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distancesdFe-Mn=0.35 nm anddFe-Fe=0.7 nm. Magnetic susceptibility measurements (3–295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +$ gΜ_{B} $StotalB. The spinsSFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin ofStotal=5/2 with exchange coupling constantsFFe-Mn=13.4 $ cm^{−1} $ andJFe-Fe= 4.5 $ cm^{−1} $. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 mT, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling withAtotal/(gNΜN)=−18.5 T. The corresponding local componentAFe is related toAtotal via spin-projection:Atotal=(6/7)$ A_{Fe} $. The resultingAFe/(gN$ Μ_{N} $)=−21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies. © J.C. Baltzer AG, Science Publishers 1994 |
abstractGer |
Abstract The magnetic properties of [L-Fe(III)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distancesdFe-Mn=0.35 nm anddFe-Fe=0.7 nm. Magnetic susceptibility measurements (3–295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +$ gΜ_{B} $StotalB. The spinsSFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin ofStotal=5/2 with exchange coupling constantsFFe-Mn=13.4 $ cm^{−1} $ andJFe-Fe= 4.5 $ cm^{−1} $. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 mT, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling withAtotal/(gNΜN)=−18.5 T. The corresponding local componentAFe is related toAtotal via spin-projection:Atotal=(6/7)$ A_{Fe} $. The resultingAFe/(gN$ Μ_{N} $)=−21.6 T is in agreement with standard values of ferric high-spin complexes. Spin-Hamiltonian parameters as obtained from Mössbauer studies and exchange coupling constants as derived from susceptibility measurements are corroborated by temperature-dependent EPR studies. © J.C. Baltzer AG, Science Publishers 1994 |
abstract_unstemmed |
Abstract The magnetic properties of [L-Fe(III)-$ dmg_{3} $Mn(II)-Fe(III)-L] ($ ClO_{4} $)2 have been characterized by magnetic susceptibility, EPR, and Mössbauer studies. L represents 1,4,7-trimethyl-, 1,4,7-triazacyclononane and dmg represents dimethylglyoxime. X-ray diffraction measurements yield that the arrangement of the three metal centers is strictly linear with atomic distancesdFe-Mn=0.35 nm anddFe-Fe=0.7 nm. Magnetic susceptibility measurements (3–295 K) were analyzed in the framework of the spin-Hamiltonian formalism considering Heisenberg exchange and Zeeman interaction:Ĥ=JFe-Mn(SFe1+SFe2)SMn +JFe-Fe(SFe1SFe2) +$ gΜ_{B} $StotalB. The spinsSFe1=SFe2 =SMn=5/2 of the complex are antiferromagnetically coupled, yielding a total spin ofStotal=5/2 with exchange coupling constantsFFe-Mn=13.4 $ cm^{−1} $ andJFe-Fe= 4.5 $ cm^{−1} $. Magnetically split Mössbauer spectra were recorded at 1.5 K under various applied fields (20 mT, 170 mT, 4T). The spin-Hamiltonian analysis of these spectra yields isotropic magnetic hyperfine coupling withAtotal/(gNΜN)=−18.5 T. The corresponding local componentAFe is related toAtotal via spin-projection:Atotal=(6/7)$ A_{Fe} $. The resultingAFe/(gN$ Μ_{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. © J.C. Baltzer AG, Science Publishers 1994 |
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