The complexes absorption of Np(Ⅴ)-Np(Ⅴ) and Np(Ⅴ)-Np(Ⅵ) have been studied in perchloric solution by spectrophotometric at 25℃.The results show that a special characteristic of actinide chemistry is their ability of formation of “cation-cation” complexes in oxidation state(Ⅴ) by adding Np(Ⅴ) and Np(Ⅵ) into Np(Ⅴ) solution,respectively.The formation of these complexes obeys the law of mass action.According to the mass action law,the constants of complexation are calculated as K1=3.20±0.13(molL-1)-1 and K2=1.13±0.13(molL-1)-1 for Np(Ⅴ)-Np(Ⅵ) and Np(Ⅴ)-Np(Ⅴ),respectively.
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