Resolution of the Acid-base Fraction Curves of the Calixarene Derivatives with Chemometric Methods

The acid-base properties of several new calix[4]arene derivatives were studied with chemometric methods by measurement of their UV absorbances under different pH. Resolving the acid-base fraction curves with chemometric methods, the pKa of these derivatives were determined and the fraction curves and pure absorbing spectra of each absorbing component in the calixarene system were obtained. The proton dissociation behavior of these derivatives was also discussed in this paper.