Complexation Kinetics of 8-Quinolinol Derivatives with Ni(II) and Zn(II) at the 1,2-Dichloroethane−Water Interface As Studied by Electrolyte Ascending Electrode Polarography
Complexation Kinetics of 8-Quinolinol Derivatives with Ni(II) and Zn(II) at the 1,2-Dichloroethane−Water Interface As Studied by Electrolyte Ascending Electrode Polarography
复制标题
电解质上升电极极谱法研究 8-喹啉衍生物与 Ni(II) 和 Zn(II) 在 1,2-二氯乙烷-水界面的络合动力学
作者：
Takeshi Shioya;S. Nishizawa;N. Teramae
用动态界面张力法和电解质上升电极极谱法研究了8-羟基喹啉（HQ）和5-烷氧甲基-8-羟基喹啉（HCnQ; n = 1，2，3，5，8）与金属离子M2+（M = Ni，Zn）在1，2-二氯乙烷（DCE）-水界面上的络合动力学。极谱测量表明，界面处形成的化学物种是阳离子1：1配合物（M（Q）+或M（CnQ）+）。对于Zn 2+，界面络合非常快，其动力学由配体从主体DCE相扩散到DCE-水界面控制。另一方面，对于Ni 2+，动力学是界面反应控制的，并且受螯合剂的烷基链长度的显著影响。
Complexation kinetics of 8-quinolinol (HQ) and 5-alkyloxymethyl-8-quinolinols (HCnQ; n = 1, 2, 3, 5, 8) with metal ions M2+ (M = Ni, Zn) at the 1,2-dichloroethane (DCE)−water interface is analyzed by dynamic interfacial tensiometry and electrolyte ascending electrode polarography. Polarographic measurements show that the chemical species formed at the interface is a cationic 1:1 complex (M(Q)+ or M(CnQ)+). For Zn2+, the interfacial complexation is very fast, and its kinetics is controlled by the diffusion of ligands from the bulk DCE phase to the DCE−water interface. On the other hand, for Ni2+, the kinetics is interfacial reaction-controlled and is significantly affected by the alkyl chain length of the chelating reagents.