Spectrophotometric and spectrofluorimetric investigation of different equilibria of a recently synthesized Schiff base with the aid of chemometric methods

► Acidity and rate of the tautomerization of a recently synthesized Schiff base were studied. ► Ground and excited states acidity constants and tautomerization rate constant were obtained. ► These parameters were obtained with the aid of hard model and Rank annihilation factor analysis. ► The effect of some factors on the fluorescence intensity of the Schiff base was studied.