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Proposed structures of Zn(II) and Al(III) complexes with quercetin (A) M are Al(III) and Zn(II), x = n = 4 for Al(III), x = n = 2 for Zn(II); rutin (B) M are Al(III) and Zn(II), x = 4, n = 5 for Al(III), x = n = 2 for Zn(II); galangin (C) x = 4 and n = 2 for Al(III), x = 2 and n = 1 for Zn(II).
