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Potentiometric and spectroscopic studies of the cobalt(II), nickel(II) and manganese(II) complexes with some aminodiphosphonic acids in aqueous solution.
Autorzy
Rok wydania
2000
Czasopismo
Numer woluminu
19
Strony
2083-2093
DOI
10.1016/S0277-5387(00)00509-X
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The stoichiometries and stability constants of the manganese(II), cobalt(II) and nickel(II) complexes with seven aminodiphosphonates [RN(CH2PO3H2)2, L] containing iminomethylenephosphonate moieties have been determined pH-metrically at 25°C and at an ionic strength of 0.20 mol dm−3 (KCl). The results suggest for L=1–6 only equimolar species: [M(H2L)], [M(HL)]−, [ML]2− and hydroxo [MH−1L]3−, in the pH range of 3–11.5, the only difference is the presence of an additional [M(H3L)]+ species at low pH for N-3-picolyliminodi(methylenephosphonic) acid. For L=7 the models contain protonated and non-protonated 1:2 species. From the comparative analysis of the stability and the spectroscopic (UV–VIS) data it has been established that the ligands coordinate to the metal ions only by the phosphonate group(s) in a monodentate or bidentate manner. The LMCT bands from O−(PO32−) to Ni2+ are at 222–211 nm.
Słowa kluczowe
Potentiometry, Equilibria, Stability constants, Manganese(II), Cobalt(II), Nickel(II) complexes, Aminopolyphosphonates, UV–VIS spectra
Adres publiczny
https://doi.org/10.1016/S0277-5387(00)00509-X
Strona internetowa wydawcy
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