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- W2032783014 abstract "The formation and thermodynamic stabilities of the mixed ligand chelates of Cu(II) and Zn(II) withl-dopa and a number of secondary ligands, i.e. penicillamine (PA), (l-ALA), glycine (gly), dipyridyl (DIPY), citric acid (HCIT), d-tartaric acid (d-TA) and sulfosalicylic acid (SSA) were investigated over the pH range 2–10 by means of equilibrium studies at a constant ionic strength of 0.12 M (NaCl) and temperature, 25.0°±0.1°C. In all the mixed ligand systems, Cu(II) and Zn(II) were predominantly bound by the secondary ligands in the pH range 2.5–5 followed by interaction withl-DOPA and the formation of the respective ternary chelates above pH 5. Cu(II) interacted more strongly than Zn(II) with the secondary ligands, i.e. the values of log KMA for Cu(II) were in the range 3.5–15.9 and for Zn(II), 2.6–5.8. The order of stabilities of the Cu(II) chelates were: HCIT⋍PA>SSA<l-ALA>DIPY≈GLY>d-TA; for Zn(II) systems, PA>DIPY≈HCIT≈l-ALA>d-TA>SSA. The stability constants for the formation of the Cu(II)-secondary ligands-l-DOPA (1:1:1) ternary chelates varied in the range 6.1–17.5 and for Zn(II) systems, 6.6–12.5. The order of Stabilities for the binding ofl-DOPA with the metal-secondary ligand systems was for Cu(II), d-TA>DIPY>l-ALA>SSA>GLY>HCIT>PA, and for Zn(II), d-TA>SSA>DIPY>HCIT>PA. Possible structures for the chelates are presented and discussed." @default.
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- W2032783014 title "Formation and stabilities of the ternary metal chelates ofl-3,4-dihydroxyphenyl alanine (l-dopa) with a number of secondary ligands" @default.
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