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. 2020 Jun 16;25(12):2782. doi: 10.3390/molecules25122782

Figure 2.

Figure 2

Figure 2

(a) Typical metal (M) chelation sites in 1,2-dihydroxy- (1, a) and 3,4-dihydroxyxanthones (2–3, b); (b) UV/Vis spectra of compound 1 in methanolic solution with sequential additions of FeCl3; (c) UV/Vis spectra of compound 1 in methanolic solution with sequential additions of CuCl2; (d) UV/Vis spectra of compound 2 in methanolic solution with sequential additions of FeCl3; (e) UV/Vis spectra of compound 2 in methanolic solution with the sequential addition of CuCl2; (f) UV/Vis spectra of compound 3 in methanolic solution with sequential additions of FeCl3; (g) UV/Vis spectra of compound 3 in methanolic solution with the sequential addition of CuCl2.