Anderson anions

Figure 16 The structure of [TeMo6024]6 ( Anderson ) anion Table 9 Anderson and Related Heteropolyanions...

Several heteropolyanion structures accommodate central octahedral heteroatoms an especially widespread type is the Dm Anderson structure (Figure 11 and Table 2). Note that two versions of the structure are known with or without protonation of the central XOe octahedron, depending upon the oxidation state of X. Although the heptametalate anions, [M7O24] (Figure 5), can be considered to be Ci, isomers of the Anderson anions, few heteropolyanions have so far been shown to adopt the former structure. 

FIGURE 19. Polyhedral representation of [La(H20)7Al(OH)6MosOi8] 4 H20 showing a supramolecular three-dimensional network, in which lanthanum-Anderson anion chains are interlinked via hydrogen bonding. Color code La, purple Mo, blue Al, cyan O, red. Solvent waters are omitted for clarity. (Reprinted with permission from ref. 43.)... 

FIGURE 23. The extensive supramolecular network involving intrachain and interchain O-H- -O hydrogen bonding in the compound [Cu (2,2 -bipy)(H20)2Cl] [Cu°(2,2 -bipy)(H20)2Al(OH)6Mo60i8] -41120. The Anderson anions are shown in polyhedral representation. Color code Al, cyan Mo, yellow O, red Cu, purple H, white circle. The bip5Tidine ligands, coordinated to Cu(Il) linkers, are not shown here for clarity (Reprinted with permission from ref. 45.)... 

Similarly, the coordination of [Al(OH)6Mo60ig] to two [Cu(phen)(H20)Cl] results in the formation of the anion, [Al(OH)6Mo60 1 gCu(phen)(H20)Cl 2] . As in the structures of other Anderson anions, the present cluster anion [Al(OH)6 MogOig] " has a B-type Anderson structure consisting of seven edge-shared... 

FIGURE 26. Asymmetric unit (as 1.5 molecules) in Na3(H20)6[Al(OH)6Mo50i8] 2H2O. Sodium coordination of the Anderson anion via terminal oxygen atoms on molybdenum is shown. Thermal ellipsoids at 50% probability. (Represented with permission from ref. 54.)... 

FIGURE 28. (a) Layer type of network formed by sodium oetahedra and Anderson anions, (b) Sodium water chain supported by the Anderson anions. (Represented with permission ref. 54.)... 

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