A Study of Formation Equilibria of the Complexes of Some Metal Cations with Polyoxa Macrocyclic Ligands
作者:
Constantin Luca,
HassanAhmed Azab,
期刊:
Analytical Letters
(Taylor Available online 1984)
卷期:
Volume 17,
issue 17
页码: 1937-1946
ISSN:0003-2719
年代: 1984
DOI:10.1080/00032718408065356
出版商: Taylor & Francis Group
关键词: Macrocyclic ligands;Crown ethers;Stability;constants;Complex formation
数据来源: Taylor
摘要:
The complexes formed by the Na+, K+, Rb+, Ca2+, UO2+2, and Ag+cations with the macrocyclic polyethers 18-crown-6, benzo-15-crown-5, and dicyclohexy1-18-crown-6 are investigated. The stability constants of these complexes have been determined potentiometrically in (90% vol.) ethanol-water solutions at 25[ddot]C and an ionic strength μ= 0.1 (achieved with tetrabuty lammonium perchlorate). The stablity of the investigated complexes was interpreted in terms of “caging” the metal cation into the cavity of the macrocyclic ligand, an effect which depends on the ratio of the diameter of the complexed cation over the diameter of the cavity of the complexing ligand.
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