Alternative complex formation model based of spectrophotometry data for the Cu(II)-bromide ion system in solution

Abstract

Simulated and experimental curves of spectrophotometric titration have been analyzed for a system in which mononuclear homoleptic complexes [MXn] (n = 1–4) are formed stepwise. In addition to the apparent decrease in the data matrix rank, there is some uncertainty in the description of the experimental data with the use of the stepwise complex formation model. A matrix method has been used for calculating the constants of binding of the ligand to the central atom with fixed coordination sites. The suggested approach makes it possible to reduce to two the number of independent variables in the least-squares optimization of titration curves without deterioration of quality of the description. The suggested method is used for calculating the intrinsic complexation constants for Cu2+ with bromide ion in methanol from spectrophotometric titration data.