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Inne
Stabilities and coordination modes of methionine in copper(II) mixed-ligand complexes with ethylenediamine, diethylenetriamine or N, N, N', N'', N''-pentamethyldiethylenetriamine in aqueous solution.
Autorzy
Rok wydania
2009
Czasopismo
Numer woluminu
28
Strony
2403-2410
DOI
10.1016/j.poly.2009.05.001
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Solution equilibrium studies on the Cu(II)–polyamine–methionine ternary systems (polyamine: ethylenediamine (en), diethylenetriamine (dien), N,N,N′,N′′,N′′-pentamethyldiethylenetriamine (Me5dien)) have been performed by pH-potentiometry, UV–Vis spectrophotometry and EPR methods. The obtained results suggest the formation of the mixed-ligand complexes with [Cu(A)(Met)]+ stoichiometry in all studied systems. Our spectroscopic results indicate the tetragonal geometry for [Cu(en)(Met)]+, the geometry slightly deviated from square pyramidal for [Cu(dien)(Met)]+ and strongly deviated from square pyramidal towards trigonal bipyramidal for the [Cu(Me5dien)(Met)]+ species. The coordination modes in these mixed-ligand complexes are discussed.
Słowa kluczowe
Copper(II) complexes, Mixed-ligand complexes, Amino acids, EPR, Vis spectroscopy, Potentiometry, Equilibria, Stability constants, Polyamines, Five-coordinate complexes
Adres publiczny
https://doi.org/10.1016/j.poly.2009.05.001
Strona internetowa wydawcy
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