Abstract
Acidity and Complex Formation of CurcuminoidsThe stoichiometric acid dissociation constants of curcumin 1a and derivatives as well as the stoichiometric stability constants of the Cu(II)‐ and Ni(II)‐complexes of these substances have been determined by pH‐potentiometric titrations in dioxane‐water mixture.The influence of different substituents on the pKa‐values and the stability constants is discussed. The complexing properties of the COCH2CO structural element of the ligands are not significantly changed when the phenyl group is substituted by the styryl group. Solid CuL2‐complexes have been characterized. The coordination of the ester group in the tricarbonyl ligand systems 4 was excluded by i.r. spectroscopy.
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