Magnetic chains formed from tetra-coordinate Co(II) complexes

2013 ◽  
Vol 67 (3) ◽  
Author(s):  
Monika Idešicová ◽  
Alžbeta Krutošíková ◽  
Viera Mrázová ◽  
Roman Boča
Keyword(s):  
Magnetic Susceptibility ◽  
Low Temperature ◽  
Exchange Interaction ◽  
Exchange Coupling ◽  
Magnetic Interaction ◽  
Donor Ligands ◽  
Coupling Constant ◽  
Exchange Coupling Constant ◽  
Π Stacking ◽  
Magnetic Chain

AbstractTwo tetra-coordinate Co(II) complexes, [CoCl2(bzfupy)2] and [CoCl2(p-tol)2] with N-donor ligands, are apparently mononuclear systems. The magnetic susceptibility at low temperature attains a maximum which is a fingerprint of the exchange interaction. The exchange coupling constant fitted to a model of 1D-magnetic chain yields J/hc = −0.50 cm−1 and −0.57 cm−1, respectively. The magnetic interaction is mediated by the π-π stacking in the first complex, and the short Cl…Cl contacts in the second.

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

Antiferromagnetic exchange in manganese(II) monophenylphosphinate and the effects of cadmium doping

1989 ◽  
Vol 67 (7) ◽  
pp. 1239-1243 ◽  
Author(s):  
Jlng-Long Du ◽  
Robert C. Thompson
Keyword(s):  
Magnetic Susceptibility ◽  
Theoretical Models ◽  
Magnetic Data ◽  
Coupling Constant ◽  
Scanning Calorimetry ◽  
Manganese Compound ◽  
Linear Chains ◽  
Magnetic Chain ◽  
Metal Materials ◽  
Polymeric Structures

Mn[H(C6H5)PO2]2, its cadmium analogue, and mixed metal materials of composition Mn1−xCdx[H(C6H5)PO2]2 (x = 0.005, 0.01, 0.09, 0.27, and 0.47) have been synthesized and characterized by X-ray powder diffraction, infrared spectroscopy, differential scanning calorimetry and low-temperature (4.2 to 80 K) magnetic susceptibility studies. The materials are shown to be isomorphous and are considered to have polymeric structures in which chains of metal atoms are linked by bridging phosphinate groups. The pure manganese compound is antiferromagnetic (maximum in xm at ~35 K) and the magnetic data for the compound have been analyzed according to two theoretical models for linear chains of antiferromagnetically coupled manganese(II) (d5, spin-free) ions. The Wagner and Friedberg model gives J = −3.00 cm−1 and the Weng model gives J = −2.78 cm−1. The effects of replacing Mn2+ by Cd2+ ions in the polymer is to increase the magnetic susceptibility (per mol of Mn) at all temperatures. Analysis of the data as a function of Cd doping indicates the incorporation of a paramagnetic component to the susceptibility which increases with increasing Cd content. In addition, the absolute value of the exchange coupling constant appears to decrease as the Cd content increases. These effects are considered in terms of a random defect model in which the replacement of Mn ions in the polymer by Cd ions results in the formation of Cd ion separated finite magnetic chain fragments. Keywords: manganese(II) monophenylphosphinate, magnetic properties, coordination polymer, cadmium doped antiferromagnet.

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