锇(Ⅷ)-DBPMP络合吸附波的 1.5次微分极谱研究

On the Polarooraphic Adsorptive Complex Wave of Osmium(Ⅷ)-4,4'-Decanedioyl-Bis-(l-Phenyl-3-Me thyl-5-Pyrazolone) (DBPMP) Complex by using 1.5 Order differential Technique.

锇(Ⅷ)-DBPMP络合物在0.2mol/L NaOH溶液中产生一灵敏的络合吸附波。峰电位为-0.97V(VS.SCE),其1.5次导数波峰电流与锇(Ⅷ)的浓度在1.0×10^(-8)0-1.0×10^(-5)mol/L范围内具有良好的线性关系。络合物吸附于电极上后,配体DBPMP在不离解下来的情况下发生还原反应,产生络合吸附波。

In the 0.2 mol / L NaOH solution containing 3.3×l0~5 mol/L DBPMP Complex, a sensitive adsorptive wave of Os(Ⅷ)-DBPMP has been obtained by using single-sweep polarography. The peak potential is-0.79 V(vs.SCE). The change of peak current of 1.5 order derivative wave is linear with the Os(Ⅷ)concentration in the range from 1×10^(-8) to 1× l0^(-5) mol/L. In the solution, the composition of the complex has been determined as [OsO_4(DBPMP)]^(2-). The electrode process and mechanism have been studied. It shows that the complex is adsorbed onto the DME, then the organic moiety of the complex reduces irreversibly, and the reduced product is also adsorbed to the DME.