ISSN:
1572-8927
Schlagwort(e):
Polarography and cyclic voltammetry
;
Gibbs energies of transfer
;
bis(biphenyl)chromium assumption
;
solvatochromic solvent parameters
;
hard and soft solvents
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Chemie und Pharmazie
Notizen:
Abstract The nature of interactions between solutes and the solvents ethanediol and 2-mercaptoethanol were studied employing polarography, cyclic voltammetry and visible spectroscopy. The polarographic and voltammetric behavior of TlClO4, Zn(CF3SO3)2, Cd(CFP3SO3)2, Pb(CF3SO3)2, Cu(CF3SO3)2, Mn(CF3SO3)2, Co(CF3SO3)2, Ni(ClO4)2·2H2O, oxygen and bis(biphenyl)-chromium(I) tetraphenylborate or iodide were measured. Gibbs energies of transfer based on the bis(biphenyl)chromium assumption were calculated for the transfer from acetonitrile into ethanediol for Tl+, Ag+, Cd2+, and Pb2+ as well as for Tl+, Cu+, Cd2+, and Pb2+ into 2-mercaptoethanol. The solvatochromic shift of acetylacetonato (N, N, N′, N′-tetramethyl-ethylenediamine)copper(II) perchlorate was used to evaluate the hard donor properties of ethanediol. The acceptor properties of both solvents were estimated from the low energy visible absorption band of bis(cyano)bis(1,10-phenanthroline)iron(II). The different behavior of ethanediol and 2-mercaptoethanol is discussed on the basis of the changes of half-wave potentials, of Gibbs energies of transfer and of the shifts of the solvatochromic compounds.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00651851
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