Basicity and the electrochemical behavior of azulen-1-yl-thiazol-2-yl diazenes

The determination of pH values at the equivalence (isosbestic) point from the electronic spectra of several azulen-1-yl-thiazol-2-yl diazenes allowed the obtaining of their pK a values. All the studied compounds are very weak bases. The pK a values were correlated with the diazenes structure. The values for oxidation and reduction peak potentials are obtained from DPV curves. A good correlation was found between the calculated values for molecular orbitals energies and the experimental recorded data for the redox processes.