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Acidity and redox potentials of a series of substituted azulen-1-yl-benzothiazol-2-yl diazenes are correlated with several theoretical parameters. From the electronic spectra of the dyes recorded at different pH, the derived pK a values correlate well with para Hammett-constants. The experimental oxidation and reduction potentials, as determined by cyclic voltammetry (CV) and differential...
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