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Binding ability of oxine-like ligands : potentiometric and polarographic study on Ni(II), Co(II), Zn(II) and Cd(II) complexes of 9-hydroxypyrido(1,2,-a)pyrimidin-4-one.
Autorzy
Rok wydania
1993
Czasopismo
Journal of Coordination Chemistry
Numer woluminu
30
Strony
283-291
DOI
10.1080/00958979308022761
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Potentiometric and polarographic studies of metal ion coordination with 9-hydroxypyrido[1,2-α]pyrimidin-4-one (HPP) with Ni(II), Zn(II), Co(II) and Cd(II) ions have been carried out. For comparison, stability constants with 8-hydroxy-imidazo[1,2-α]pyridine (HIP) were also measured. Due to the low solubility of the latter ligand complexes, measurements were made also in dioxan/water solutions. In the case of both ligands the coordination mode is the same. The oxine-like binding via {N, O−} donor set leads to formation of stable ML and ML2 complexes. Stability constants clearly indicate that both ligands are very effective and the HPP, having a more favourable position of the electron pair on nitrogen, forms stronger complexes with smaller metal ions i.e., Ni(II), Zn(II) and Co(II). Cd(II) is better fitted to the HIP donor set.
Słowa kluczowe
Pyrimidones, oxines, complexes, stability constants
Adres publiczny
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