Fig. 7

(a) TD-DFT/CAM-B3LYP/6–31G(d, p) calculated UV – vis. absorption spectra of Glycine, Glycine (NH2)-ZnO-H2O (Model 1), Glycine (COOH)-ZnO-H2O (Model 2), Glycine (NH2)-MgO-H2O (Model 3), Glycine (COOH)-MgO-H2O (Model 4), Glycine (NH2)-CaO-H2O (Model 5), and Glycine (COOH)- CaO-H2O (Model 6), (b) experimental UV – vis. absorption spectra of glycine and glycine/ZnO nanocomposite, and the effect of different solvents on (c) glycine, (d) Model 1, (e) Model 2, (f) Model 3, (g) Model 4, (h) Model 5, and (i) Model 6.