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The complexation of Cr~ 3+ with F~ - undergoes a multistep reversible process. An approach to research the involved equilibria and kinetics using suitable chemometrics methods to the online measured UV-Vis spectra is proposed. By investigating the equilibrium spectra of the complexes at different molar ratios of M to L(metal to ligand) and 50 ℃, the result of Principal Component Analysis(PCA) shows that three complexes, ML, ML_ 2 and ML_ 3 , can be formed under the research conditions. The spectrum of each complex was then analyzed and the accumulated equilibrium constants were calculated by applying Target Testing Factor Analysis(TTFA). Meanwhile, a reactive intermediate was observed before the formation of ML_ x during the specific kinetic study at 15 ℃ . The equilibrium constant and spectrum of the intermediate as well as the rate constants were all resolved by using TTFA.
The approach to research the associated equilibria and kinetics using a chemistries method to the online measured UV-Vis spectra is proposed. By investigating the equilibrium spectra of the complexes at different molar ratios of M to L (metal to ligand) and 50 ° C, the result of Principal Component Analysis (PCA) shows that three complexes, ML, ML_ 2 and ML_3, can be formed under the research conditions. complex was then analyzed and the accumulated equilibrium constants were calculated by applying Target Testing Factor Analysis (TTFA). Meanwhile, a reactive intermediate was observed before the formation of ML_x during the specific kinetic study at 15 ° C. The equilibrium constant and spectrum of the intermediate as well as the rate constants were all resolved by using TTFA.