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• W1559619095 abstract "Abstract The decomposition of H 2 O 2 (8 · 10 −3 M ) catalyzed by complexes of Cu 2+ (4 · 10 −4 M ) with various oligomers and polymers of glycine, L‐lysine or L‐glutamic acid was investigated in aqueous solution in the pH range 5–11, at 24°C and at low ionic strength. Previous investigations have shown that the decomposition of H 2 O 2 is catalyzed by Cu 2+ ‐complexes capable of forming Cu 2+ ‐peroxocomplexes. With increasing pH the catalytic activity of Cu 2+ ‐complexes with glycine or glycylglycine (1:1) increases while the activity of Cu 2+ ‐complexes with tri‐ or tetraglycine (1:1) is comparatively small at higher pH values apparently because in the latter cases the coordination positions of the copper become progressively occupied by the peptides. This interpretation is in accordance with the pH‐dependence of the light‐absorption spectra of the latter complexes. Cu 2+ ‐complexes with poly‐α, L ‐lysines of various molecular weights (molar ratios Cu 2+ : lysine residues = 1:15) have a catalytic activity comparable to or higher than that of the complex Cu 2+ ‐ethylenediamine (1:1), indicating two available coordination positions for formation of peroxo‐complexes. On the other hand, the system Cu 2+ ‐ L ‐lysine (1:15) showed no significant activity probably because all coordination positions at the Cu 2+ are occupied by lysine. Despite the excess of ligand groups over Cu 2+ in the polylysine systems the structure of this polyamino acid apparently does not allow its full coordination with these groups under the conditions investigated. Two adjacent chelating ε‐amino groups are considered as the main ligand groups of the polymer to each copper ion. The Cu 2+ ‐poly‐α, L ‐glutamic acid complex examined (Cu 2+ : glutamic acid residues = 1:5) shows comparatively little activity. In this case, absorption spectra indicate formation of hydroxo‐complexes at higher pH. Besides the effects of structure, the electrostatic fields of the charged polyelectrolytes polylysine or polyglutamic acid are also considered to affect the rates of catalysis." @default.
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• W1559619095 date "1968-07-10" @default.
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• W1559619095 title "Cu²⁺-Komplexe von Polyaminosäuren in wässeriger Lösung Katalytische Aktivität (H₂O₂-Zerfall) und Struktur" @default.
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• W1559619095 doi "https://doi.org/10.1002/hlca.19680510608" @default.
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