Complexation Kinetics of 5-Alkyloxymethyl-8-quinolinols at Liquid−Liquid Interfaces As Studied by Dynamic Interfacial Tensiometry
| Autor: | Norio Teramae, Seiichi Nishizawa, Takeshi Shioya |
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| Rok vydání: | 1998 |
| Předmět: |
inorganic chemicals
chemistry.chemical_classification Diffusion Kinetics Surfaces and Interfaces Condensed Matter Physics Partition coefficient Surface tension Reaction rate constant Adsorption chemistry Phase (matter) Electrochemistry Physical chemistry Organic chemistry General Materials Science Spectroscopy Alkyl |
| Zdroj: | Langmuir. 14:4552-4558 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | The effect of alkyl chain length of chelating reagents on the complexation kinetics of 8-quinolinol (HQ) and 5-alkyloxymethyl-8-quinolinol (HCnQ; n = 1, 2, 3, 5, 8) with transition metal ions (M2+: Ni2+, Zn2+) at liquid−liquid interfaces is studied by dynamic interfacial tensiometry. A decrease in the dynamic interfacial tension is caused by the interfacial adsorption of a 1:1 complex (M(CnQ)+). The interfacial complexation kinetics for Zn2+ is controlled by the diffusion of ligands from the bulk organic phase to the interface. For Ni2+, the kinetics is also diffusion-controlled for the ligands with short alkyl chains; however, it is controlled by the complexation reaction at the interface for those having longer alkyl chains. The interfacial complexation rate is found to be faster for Zn2+ than for Ni2+, and it correlates closely with the partition coefficient of the ligands. For the reaction-controlled complexation kinetics, a new procedure for calculating the interfacial complexation rate constant (k1... |
| Databáze: | OpenAIRE |
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