Hydrothermal and solid-state transformation of ruthenium-supported Keggin-type heteropolytungstates [XW11O39{Ru(ii)(benzene)(H2O)}]n− (X = P (n = 5), Si (n = 6), Ge (n = 6)) to ruthenium-substituted Keggin-type heteropolytungstates
(Ru担持ケギン型ヘテロポリ酸のRu置換型ケギン型ヘテロポリ酸への水熱および固相転換)