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Unexpected formation of the copper(II) dinuclear mixed-ligand species in the ternary system of N,N,N',N'',N'''-pentamethyldiethylenetriamine with methionine- or histidinehydroxamic acids in aqueous solution.
Autorzy
Rok wydania
2007
Czasopismo
Numer woluminu
26
Strony
4345-4353
DOI
10.1016/j.poly.2007.05.033
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Equilibrium studies of the mixed-ligand complexes of the copper(II) ion with pentamethyldiethylenetriamine (N,N,N′,N″,N″-pentamethyl-[bis(2-aminoethyl)amine], Me5dien) as a primary ligand and methioninehydroxamic acid (2-amino-4-(methylthio)butanehydroxamic acid, Metha) or histidinehydroxamic acid (2-amino-3-(4′-imidazolyl)propanehydroxamicacid, Hisha) as a secondary ligand L were performed by potentiometric titration, UV–Vis and EPR spectroscopy. The results show that in these ternary systems the dinuclear [Cu2(Me5dien)L2H−1]+ mixed-ligand species is formed as a predominant one in the basic solution. The monouclear [Cu(Me5dien)L]+ species is formed in low concentration. Our spectroscopic results indicate that the geometry of these mixed-ligand five-coordinate complexes is strongly distorted towards trigonal-bipyramidal.
Słowa kluczowe
Copper(II) complexes, Mixed-ligand complexes, Aminohydroxamic acids, Stability constants, Five-coordinate complexes, Polyamines
Adres publiczny
https://doi.org/10.1016/j.poly.2007.05.033
Strona internetowa wydawcy
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