Figure 4From: Tautomerism of4,4′-dihydroxy-1,1′-naphthaldazine studied byexperimental and theoretical methodsTemperature dependence of the absorption spectra of 1 in absoluteethanol(1.7 × 10-5 M),recorded in the temperature range 20 – 60 °C. Solidline - 20°C, dashed lines correspond to 30, 40, 50 and60°C. In the inset the difference spectra are shown.Back to article page