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首页> 外文期刊>Journal of thermal analysis and calorimetry >Thermal studies of cobalt(II);;nickel(II) and copper(II) complexes of 4-(sulfonylazido phenylazo) pyrazolones
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Thermal studies of cobalt(II);;nickel(II) and copper(II) complexes of 4-(sulfonylazido phenylazo) pyrazolones

机译：Thermal studies of cobalt(II);;nickel(II) and copper(II) complexes of 4-(sulfonylazido phenylazo) pyrazolones

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摘要

The thermal decompositions of cobalt(II), nickel(II) and copper(II) complexes of 4-(3'-sulfonyl-azido-6'-methoxyphenylazo)-1-phenyl-3-methyl-2-pyrazolin-5-one H(D~1-SO_2N_3) and 4-(4'-sulfonylazido phenylazo)-3-phenyl-3-methyl-2-pyrazolin-5-one H(D~2-SO_2N_3) were studied by thermogravimetry. The decomposition in all cases takes place along two stages. The first stage is due to the elimination of water and nitrogen molecules with the formation of tetracoordinate complexes containing nitrene reactive species M(DSO_2N:)_2. The second stage represents the decomposition of the material to the metal oxide. The kinetics of the decomposition were examined by using Coats Redfern, the decomposition in all complexes was found to be first order for the first and second stages. The activation energies and other activation parameters (ΔH~* and ΔS~* and ΔG~*) were computed and related to the bonding and stereochemistry of the complexes.

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