Figure 6From: Tautomerism of4,4′-dihydroxy-1,1′-naphthaldazine studied byexperimental and theoretical methodsEffect of temperature and sonication on the absorption spectra ofchloroform solution of compound 1(1.7 × 10-5 M)– temperature range 50 – 10°C , sonicationtime - 3 minutes; solid line - 50°C , the dashedlines correspond to 40, 30, 20 and 10°C. The inset showsthe temperature dependence (20 – 50°C) of a solutioninitially sonicated for 3 seconds.Back to article page