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/LLa3+、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.
Voltammetric behavior studies on the interaction of Ln3+ ions with NAD+ andNAD-LDH complex were presented. The results showed that Ln3+ interacted with NAD+ bydividing the reduction wave of NAD+ at -0. 94 V into 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 LDH and was reduced at - 1. 16 V. The dissociation constant ofNAD-LDH was determined. When NAD-LDH complex was formed, the addition of5μmol/L La3+, Ce3+, Pr3+, Eu3+, Gd3+, Dy3+, Yb3+, Lu3+ respectively increased the dis-sociation constant of NAD-LDH complex in the range of 40% ~70%. These results could beused as an explanation for the inhibition of Ln3+ ions on LDH activity.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1997年第7期1027-1030,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金