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. 2018 Aug 14;6:336. doi: 10.3389/fchem.2018.00336

Figure 1.

Figure 1

Polyhedral representation of key POM structures tested in this study. (A) Preyssler structure [NaP5W30O110]14− (Jeannin et al., 2007); (B) Dawson structure [X2M18O62]n− (X = P5+, As5+, S6+; M = Mo, W, V) (e.g., Contant et al., 2007); (C) α-Keggin structure [PW12O40]3− (Phillips, 1950); (D) mono-substituted Keggin structure [H2XYM11O40]n− [X = Co2+, Y = Ti4+, n = 6 (Kraus et al., 2005); X = P5+, Y = Co2+, n = 5 (Komura et al., 1976)]; (E) di-lacunary γ-Keggin structure [SiW10O36]8− (Téazéa et al., 2007); (F) tri-lacunary α-Keggin structure [XW9O33]9− (X = Sb5+, As5+) (Tourné et al., 1973); (G) octomolybdate [α-Mo8O26]4− (Klemperer, 2007); (H) paratungstate [W12O40(OH)2]10− (Evans and Rollins, 1976); (I) Anderson structure [XM6O24Hk]n− (X = Te6+, M = W, k = 0, n = 6 Schmidt et al., 1986; X = Ni2+, M = Mo, W, k = 6, n = 4 (Rozantsev et al., 2009; Gumerova et al., 2015). Color code: all addenda MO6 octahedra, green polyhedra; heteroatom X, yellow spheres or polyhedra; Na in (A), blue sphere; (C), black spheres; CoO6 and TiO6 in (D), pink polyhedra.