Synthesis, Crystal Structure, and Solution Stability of Keggin-Type Heteropolytungstates (NH4)6NIII0.5 [α-FeIIIO4W11O30Ni IIO5 (OH2)]×nH2O, (NH4)7Zn0.5 [α-ZnO4W11O30ZnO5 (OH2)]×nH2O, and (NH4)7NiII0.5 [α-ZnO4W11O30Ni IIO5(OH2)]×nH2O (n ≈ 18).

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