Fig. 1. Molecular structure of (a) [ε-Al13O4(OH)24(H2O)12]7+ (ε-Al13), (b) [δ-Al13O4(OH)24(H2O)12]7+ (δ-Al13), (c) [γ-Al13O4(OH)24(H2O)12]7+ (γ-Al13), (d) [Al13(OH)24(H2O)24]15+ (F-Al13), (e) [Al8(OH)14(H2O)18]10+ (Al8), (f) [Al5O2(OH)2(HPDA)4(L-Val)4]+ (Al5), (g) [Al4(OH)6(H2O)12]6+ (Al4), (h) [Al15O4(OH)20(hpdta)4]3− (Al15), (i) [Al26O8(OH)50(H2O)20)]12+ (Al26), (j) [Al30O8(OH)56(H2O)26]18+ (Al30), and (k) [Al32O8(OH)60(H2O)28(SO4)2]16+ (Al32), (l) [Al32(benzoate)36(OiPr)4(μ3-O)24(μ4-O)4] (NF-Al32). [AlO6], [AlO4] and [SO4] are shown by the light blue, dark blue, and yellow polyhedrons, respectively.
