Very weak electron–electron exchange interactions in paramagnetic dinuclear tris(pyrazolyl)boratomolybdenum centres with extended bridging ligands: estimation of the exchange coupling constant J by simulation of second-order EPR spectra †

1999 ◽  
pp. 4341-4347 ◽  
Author(s):  
Peter K. A. Shonfield ◽  
Andreas Behrendt ◽  
John C. Jeffery ◽  
John P. Maher ◽  
Jon A. McCleverty ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Exchange Interactions ◽  
Second Order ◽  
Electron Exchange ◽  
Epr Spectra ◽  
Coupling Constant ◽  
Bridging Ligands ◽  
Exchange Coupling Constant ◽  
Weak Electron

Direct Measurement of Subnetwork Exchange Coupling Constant for Ferrimagnets

1994 ◽  
Vol 33 (Part 1, No. 5A) ◽  
pp. 2541-2543 ◽  
Author(s):  
Hong Fu ◽  
Te-ho Wu ◽  
M. Mansuripur
Keyword(s):  
Direct Measurement ◽  
Exchange Coupling ◽  
Coupling Constant ◽  
Exchange Coupling Constant

Determination of the Exchange-Coupling Constant of an Fe3+−Fe3+Pair in a Cubane-Type Iron−Sulfur Cluster

1997 ◽  
Vol 119 (37) ◽  
pp. 8732-8733 ◽  
Author(s):  
Sun Jae Yoo ◽  
Zhengguo Hu ◽  
Christopher Goh ◽  
Emile L. Bominaar ◽  
Richard H. Holm ◽  
...  
Keyword(s):  
Exchange Coupling ◽  
Coupling Constant ◽  
Iron Sulfur Cluster ◽  
Sulfur Cluster ◽  
Iron Sulfur ◽  
Exchange Coupling Constant

Ab InitioCI Determination of the Exchange Coupling Constant of Doubly-Bridged Nickel(II) Dimers

1996 ◽  
Vol 35 (6) ◽  
pp. 1609-1615 ◽  
Author(s):  
O. Castell ◽  
R. Caballol ◽  
V. M. García ◽  
K. Handrick
Keyword(s):  
Exchange Coupling ◽  
Coupling Constant ◽  
Exchange Coupling Constant

Y89NMR study of the exchange coupling constant between theCuO2layer and the Gd ion inGdxY1−xBa2Cu3O7−δ

1990 ◽  
Vol 41 (13) ◽  
pp. 9513-9515 ◽  
Author(s):  
H. Sakamoto ◽  
M. Tei ◽  
H. Takai ◽  
K. Mizoguchi ◽  
K. Kume
Keyword(s):  
Exchange Coupling ◽  
Coupling Constant ◽  
Exchange Coupling Constant

Metal-nitroxyl interactions. 25. Exchange interactions via saturated linkages in spin-labeled porphyrins

1982 ◽  
Vol 60 (12) ◽  
pp. 1392-1401 ◽  
Author(s):  
Kundalika M. More ◽  
Gareth R. Eaton ◽  
Sandra S. Eaton
Keyword(s):  
Electron Spin ◽  
Room Temperature ◽  
Pyrrole Ring ◽  
Variable Temperature ◽  
Exchange Interactions ◽  
Spin Coupling ◽  
Epr Spectra ◽  
Coupling Constant ◽  
Acrylic Ester ◽  
Cis And Trans

A series of spin-labeled copper porphyrins has been prepared in which nitroxyl radicals are attached to a porphyrin pyrrole ring by propionamide and propionate ester linkages. The solution epr spectra at room temperature indicate that the values of the electron spin – electron spin coupling constant, J, for these compounds are in the range 4 to 18 G, depending on the solvent and the size of the nitroxyl ring. Below −45 °C two isomers with different values of J were observed in the epr spectra of two of the compounds. Variable temperature epr spectra were also analyzed for analogous spin-labeled copper porphyrins which have cis and trans acrylic ester and acrylamide linkages between the porphyrin and the nitroxyl ring. Comparison of the values of J for the complexes with saturated and unsaturated linkages suggests that σ-bonding pathways dominate the copper–nitroxyl interaction in these compounds.

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