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<正>The oxygenation constants(Ko_2)of cobalt(Ⅱ)hydroxamates(CoL_2~1-CoL_2~3)with benzo-15-crown-5(B15C5)pendants were measured over the range of-5 to+20℃,and the values of thermodynamic parameters(ΔH~0 andΔS~0)were calculated based on these(No_2)valu