Modeling of equilibriums of formation of polynuclear chelates of nickel(ii) with histidine

2014 
Electronic absorption spectroscopy has been applied to study of protolytic and complex formation equilibriums in binary and tertiary systems containing nickel(II) salt, ethylenediaminetetraacetic acid and 2-amino-3-(imidazol-2-yl)propionic acid (ionic strength 0.1 mol/L aqueous NaClO4, 20±2°C). Fitting of experimental spectral properties as function of pH and the components concentration requires dissociation constants of the ligands as well as stability constants of homoligand, heteroligand, and polynuclear complexes as parameters. These parameters have been estimated from the best fit model, and possible complexes structures have been suggested.
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