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Inne
Complexes of vanadium(III) with aromatic amino acids and L-proline in aqueous solution.
Autorzy
Rok wydania
2009
Czasopismo
Numer woluminu
28
Strony
1568-1572
DOI
10.1016/j.poly.2009.03.015
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The equilibria of the complexation processes of V3+ ion with l-phenylalanine, l-tyrosine, l-tryptophan and l-proline in aqueous solution were studied by potentiometric and spectroscopic (UV, Vis, CD) methods. The results indicate that all ligands (except l-tyrosine) form only 1:1 species with vanadium(III) ion in the pH range about 2–5. More complex equilibria were observed in the vanadium(III)–l-tyrosine system. Only in this system relatively stable ML2 species predominantly exists in the pH range 3–5. The results of spectroscopic measurements indicate that in ML and ML2 species chelated bounds through O and N atoms appear in all investigated systems. Above pH 5 strong hydrolysis processes of vanadium(III) occurred.
Słowa kluczowe
Vanadium(III), Stability constants, Amino acids, Speciation
Adres publiczny
https://doi.org/10.1016/j.poly.2009.03.015
Strona internetowa wydawcy
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