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• W2071361293 abstract "Three cobalt(II) complexes, [Co(X) 2 (4NOpy) 4 ] (X = NCO-, NCS-, and Br - ; 4NOpy = 4-(N-tert-butylaminoxyl)-pyridine) were prepared, and their molecular structures were characterized by X-ray structure analysis. The molecular geometry of [Co(X) 2 (4NOpy) 4 ] (X = NCO - and NCS - ) is a compressed octahedron, in which the counter ions occupy the apical positions with short bond distances of 2.064-2.098 A. In the crystalline state, from plots of mol vs T and Χ' mol vs T, [Co(NCO) 2 (4NOpy) 4 ] and [Co(NCS) 2 (4NOpy) 4 ] are antiferromagnets with T N = 4.5 and 15 K, respectively. In frozen solution, on the other hand, both complexes and [Co(Br) 2 (4NOpy) 4 ] functioned as single-molecule magnets. The Χ mol vs T plot for [Co(Br) 2 (4NOpy) 4 ] gave a effective activation barrier (U eff ) of 20 K for the reorientation of the spin. From the field dependence of magnetization at various temperatures below 5 K for [Co(X) 2 (4NOpy) 4 ] (X = NCO - , NCS - , and Br - ) the values of the zero-field splitting parameters, D/k B , were estimated to be -14, -9.7, and -4.5 K with S = 5/2, respectively. Theoretical studies based on the ligand-field theory model for [Co(NCO) 2 (4NOpy) 4 ] gave an exchange coupling parameter, J/k B , of 29 K and a thermodynamic activation barrier, U, of 60 K." @default.
• W2071361293 created "2016-06-24" @default.
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• W2071361293 date "2006-09-01" @default.
• W2071361293 modified "2023-09-25" @default.
• W2071361293 title "Magnetic Properties of 1:4 Complexes of Co^IIX₂(X = NCO⁻, NCS⁻, and Br⁻) with 4-(<i>N</i>-<i>tert</i>-Butylaminoxyl)pyridine. Antiferromagnets in Crystalline States and Single-Molecule Magnets in Frozen Solutions" @default.
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• W2071361293 doi "https://doi.org/10.1246/bcsj.79.1372" @default.
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