高等学校化学学报 ›› 1997, Vol. 18 ›› Issue (7): 1027.

• 论文 • 上一篇    下一篇

稀土离子与NAD+和NAD-LDH相互作用的伏安行为研究

汪勋清, 高小霞   

  1. 北京大学化学系, 北京 100871
  • 收稿日期:1996-12-23 出版日期:1997-07-24 发布日期:1997-07-24
  • 通讯作者: 高小霞.
  • 作者简介:汪勋清, 男, 31岁, 博士研究生.
  • 基金资助:

    国家自然科学基金

Voltammetric Behavior Studies on the Interaction Between Lanthanide Ions and NAD+, NAD-LDH Complex

WANG Xun-Qing, GAO Xiao-Xia   

  1. Department of Chemistry, Peking University, Beijing 100871
  • Received:1996-12-23 Online:1997-07-24 Published:1997-07-24

摘要: 报道了稀土离子与NAD+和NAD-LDH相互作用的伏安行为,研究结果表明,稀土离子能够与NAD+发生作用,使NAD+在-0. 94V处的还原峰分裂为2个还原峰;NAD+和LDH在汞电极上可形成络合物,络合物的还原峰在-1. 16V处,加入5μmol/L La3+、Ce3+、pr3+、EU3+、Gd3+、Dy3+、Yb3+和LU3+离子,能增大NAD-LDH络合物的解离常数约40%~70%,说明稀土离子在LDH催化体系中起抑制作用.

关键词: 稀土离子, NAD+, NAD-LDH, 伏安行为

Abstract: Voltammetric behavior studies on the interaction of Ln3+ ions with NAD+ andNAD-LDHcomplex were presented.The results showed that Ln3+ interacted with NAD+ bydividing the reduction wave of NAD+ at -0.94 Vinto two waves, which could be attributedto the binding of Ln3+ ions with the pyrophosphorous moiety of NAD+.The effect of Ln3+ions on NAD+ was progressively eliminated by adding EDTA.On mercury electrode NAD+formed a complex with LDHand was reduced at-1.16 V.The dissociation constant ofNAD-LDHwas determined.When NAD-LDHcomplex was formed, the addition of5μmol/L La3+, Ce3+, Pr3+, Eu3+, Gd3+, Dy3+, Yb3+, Lu3+ respectively increased the dis-sociation constant of NAD-LDHcomplex in the range of 40%-70%.These results could beused as an explanation for the inhibition of Ln3+ ions on LDHactivity.

Key words: Ln3+ ions, NAD+, NAD-LDH, Voltammetric behavior

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