Abstract
The theory of structural stability, being based on the number of closed loops per MO 6 octahedral unit in the polyanion-cage, has been applied to a variety of heteropoly- and isopoly-compounds with previously unreported structures. The discussion includes the prediction of the structure of lacunary Keggin heteropoly-compound, Cs 7Na 2[PW 10O 37]·8H 2O, recently obtained by Knoth and Harlow, the reinvestigation of mixed-type Keggin polyanions, [SiW 9Co 3(H 2O) 3O 37] 10− and [SiW 11CoO 39] 6−, recently prepared by Pope's group, the interpretation of chemical behaviours of some molybdo- and tungsto-vanadates, the structural stabilities of Jeannin-type [As 2W 21O 69(H 2O)] 6− polyanion and its related compounds, and some remarks on Weakley-type [X(W 5O 18) 2] n− polyanions and Flynn-Stucky-type [X(Nb 6O 19) 2] n− complexes belonging to the hybrid-complex of polyanion.
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