Abstract
Thermostating of the aqueous solution of Na9[SbW9O33] with K2[Ir(OH)6] at 70 °C for 17 h changes the solution’s color from blue to brown. The addition of KNO3 to the reaction solution and subsequent evaporation in air causes crystallization of the products to yield yellow crystals of composition K5.47Na2.3[Ir0.17Sb0.83W6O24](NO3)0.6·12H2O containing an Anderson-type anion $${[{\rm{S}}{{\rm{b}}^{\rm{V}}}{\rm{W}}_6^{{\rm{VI}}}{{\rm{O}}_{24}}]^{7 - }}$$ with ∼20% of antimony positions occupied by iridium.
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