Mutua influenza nella estrazione di complessi anionici e cationici - Studio sul Ba-dicicloesil-18-crown6-Co(II)tiocianato

Licastro, Francesca (1981) Mutua influenza nella estrazione di complessi anionici e cationici - Studio sul Ba-dicicloesil-18-crown6-Co(II)tiocianato. Accademia Peloritana dei Pericolanti - Classe di Scienze FF.MM.NN., LIX (1). pp. 69-82.

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Abstract

In order to study the influence of the charge of the counterion on promoting the extraction of either cobalt(II)-tris-thiocyanate species with one negative charge or double charged cobalt(II)-tetra-thiocyanate species, partition equilibria bave been studied at 25°C between an aqueous phase at a 3M ionic strength and dichloromethane in the presence of a divalent cation, $Ba^2^+$, and as a function of the concentraction of thiocyanate and of a polyether (dicycloexyl-18-crown6) suitabie to be coordinated by barium. Being either thiocyanate or polyether absent, no appreciable extraction of both barium and cobalt has been observed into dichloromethane. When both are present, they mutually influence the barium and cobalt extraction, as the cationic 1: 1 barium-polyether and anionic 1: 4 cobalt-thiocyanate species, which are double-charged and give rise to an ion pair.
The partition constant have been determined and the extraction mecanism has been discussed.

Item Type:	Article
Subjects:	M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Fisiche, Matematiche e Naturali > 1981 M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Medico-Biologiche > 1981 M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Scienze Giuridiche, Economiche e Politiche > 1981 M.U.S. - Miscellanea > Atti Accademia Peloritana > Classe di Lettere Filosofia e belle Arti > 1981
Depositing User:	Dr PP C
Date Deposited:	09 Oct 2012 09:12
Last Modified:	09 Oct 2012 09:12
URI:	http://cab.unime.it/mus/id/eprint/1115

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