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Ferric complexes of acetoacetyl derivatives of poly( L ‐lysine), poly( L ‐ornithine), and poly( L ‐diaminobutyric acid). I. Preparation and absorption properties in solution
Author(s) -
Palumbo M.,
Cosani A.,
Terbojevich M.,
Bacchion G.,
Peggion E.
Publication year - 1976
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1976.360151111
Subject(s) - chemistry , ferric , solvent , absorption (acoustics) , ferric ion , inorganic chemistry , polymer chemistry , medicinal chemistry , nuclear chemistry , stereochemistry , organic chemistry , physics , acoustics
Poly( N ε ‐acetoacetyl‐ L ‐lysine), poly( N δ ‐acetoacetyl‐ L ‐ornithine) and poly( N γ ‐acetoacetyl‐ L ‐diaminobutyric acid) form colored complexes with ferric ions in water/dioxane solutions. These complexes are soluble at pH values lower than 2.8 and show their maximum absorption at 257 nm in the uv and at 478 nm in the visible region; whereas the ferric complex of the model compound n ‐hexylacetoacetamide exhibits absorptions centered at 258 and 536 nm, respectively. It is shown that in the complex of the model compound one metal ion is bound per acetoacetamide group, while in the complexes of the three polymers two β‐ketoamides side chains are bound per ferric ion under the same solvent, pH, concentration, and ionic strength conditions. The binding constants of ferric ions to the three polymers, and the formation constant of the ferric complex of the model compound are also evaluated.