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Inne
Complexes of aminophosphonates. 2. Transition metal complexes of aminophosphonic acid analogues of aspartic acid and glutamic acid.
Autorzy
Rok wydania
1989
Czasopismo
Numer woluminu
155
Strony
281-287
DOI
10.1016/S0020-1693(00)90425-0
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
The stoichiometries and stability constants of the proton, cobalt(II), nickel(Il), copper(II) and zinc(II) complexes of 2-amino-3-phosphonopropionic acid (β-P-Asp), 3-amino-3-phosphonopropionic acid (α-P- Asp) and 2-amino-4-phosphonobutanoic acid (γ-P- Glu) have been determined pH-metrically at 25 °C and at an ionic strength of 0.2 mol dm−3 (KCl). [p ]From the stability data and the spectral parameters of the complexes, it has been established that, similarly as for the aminocarboxylate analogues, the metal ion bonding mode is basically bidentate with P-Glu and tridentate with P-Asp. However, the more basic character of the -PO32− group than that of the -COO- group leads to an enhanced formation of various protonated complexes. PO32−/COO− substitution in the α-position results in a more marked ambidentate character of P-Asp in the copper(II) complexes than does that in the β-position.
Adres publiczny
https://doi.org/10.1016/S0020-1693(00)90425-0
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