论文部分内容阅读
用pH电位法研究了在0.1M KCl水溶液中(30.0±0.1℃)的镍(Ⅱ)-亚氨基二乙酸(IMDA)与N-邻羟基等基氯乙酸(HBG)的加合反应、镍(Ⅱ)-酒石酸(Tart)与HBG的取代反应以及镍(Ⅱ)-HBG的络合反应,并测得了Ni(Ⅱ)-IMDA-HBG加合反应平衡常数K_(111)、混合型络合物积累生成常数β_(111)和Ni(Ⅱ)-Tart-HBG取代反应平衡常数K_(r1)、混合型络合物积累生成常数β_(111)以及Ni(Ⅱ)-HBG络合物的逐级生成常数K_(101)、K_(102)、积累生成常数β_(102)和Ni(Ⅱ)-Tart络合物的积累生成常数β_(120)。其结果如下: Ni(Ⅱ)-IMDA-HBG体系 lgk_(111) 7.10,lgβ_(111)15.36 Ni(Ⅱ)-Tart-HBG体系lgk_(r1) 5.13,lgβ_(111)12.68,lgβ_(120)。7.55 Ni(Ⅱ)-HBG 体系 lgk_(101)9.07,lgk_(102) 5.54,lgβ_(102)14.61 讨论了pH滴定曲线、混合型络合物和Ni—HBG络合物的稳定性以及碱性范围Ni(Ⅱ)与Tart可能的络合形式。
Adduct reaction of nickel (Ⅱ) -iminodiacetic acid (IMDA) with N-ortho-hydroxyisochloroacetic acid (HBG) in 0.1 M KCl aqueous solution (30.0 ± 0.1 ℃) Ⅱ) - the substitution reaction of Tart with HBG and the complexation reaction of Ni (Ⅱ) -HBG, and the equilibrium constants of K (111), Ni (Ⅱ) -IMDA- The accumulation constants β_ (111) and Ni (Ⅱ) -Tart-HBG substitution reaction constant K_ (r1), the mixed complex accumulation constant β_ (111) and Ni (Ⅱ) -HBG complex Generating constants K_ (101), K_ (102), accumulation accumulation constant β_ (102), and accumulation accumulation constant β_ (120) of Ni (II) -Tart complex are generated. The results are as follows: Ni (Ⅱ) -IMDA-HBG system lgk_ (111) 7.10, lgβ_ (111) 15.36 Ni (Ⅱ) -Tart-HBG system lgk_ (r1) 5.13, lgβ_ (111) 12.68, lgβ_ (120). 7.55 Ni (Ⅱ) -HBG system lgk_ (101) 9.07, lgk_ (102) 5.54, lgβ_ (102) 14.61 The stability of pH titration curves, mixed complexes and Ni- Possible complexation between Ni (Ⅱ) and Tart.