~1HNMR法测定铀酰离子的水合数

DETERMINATION OF HYDRATION NUMBER OF URANYL ION BY ~1HNMR

摘要: 报道了~1HNMR法测定铀酰离子水合数的结果。在高氯酸体系中,随着C_(H_2o)/Cuo_2~(2+)增大,铀酰离子的水合数由4变至5。在盐酸体系中,铀酰离子的水合数随酸浓度的增大而减少。当C_(HCI)/Cuo_2~(2+)达到4.0时,铀酰离子不以水合物形式存在。在硝酸体系中,C_(HNO_3)/C_(uo_2~(2+))≥2:1时铀酰离子以二水合物形式存在。对于C_(H_2o)/C_(uo_2~(2+))值较大的情况,用六甲基二硅醚为内标物测定水合数。根据测得的结果对铀(Ⅵ)配位化合物在溶液中可能存在的结构作了探讨。

Abstract: The hydration number of uranyl ion is determined by 1HNMR at low temperature. In perchloric acid, the hydration number of uranyl ion varies from 4 to 5 with the increment of CH2O/CUO22+ mole ratio. In hydrochloric acid, the hydration number of uranyl ion decreases with the increment of CHCl/Cuo22+ mole ratio. When CHCl/CUO22+ =4. 0,uranyl ion is coordinated with no water molecule. In nitric acid,when CHNO3/CUO 22+≥2. 0 uranyl ion is coordinated with two water molecules and it is independent of the concentration of nitric acid. The probable structures of coordination compounds of U(VI) in solution are discussed.