Aimed at substantiating the formation mechanism of the heteropolytungstates of the 2:11 type: [HhMm+O6Xx+O11O30](14‐m‐x‐h)‐, via complexes of the 1:11 type, attempts were made to introduce a second heteroatozn in the latter. A new, simple synthesis method was established for the 2:11 heteropolytungstates (X = P, Si; M = Ni), starting with complexes of the type [Xx+W11O39]12‐x (X = P, Si) and by using an ion exchange method (Amberlite I.R. 120. Ni2+, K+). The correctness of the supposed reaction way was demonstrated and at the same time, the close structural relationship between the hetero‐polytung̀states of the type 1:11 and 2:11 ‐was pointed out.
The syntheses and results of the physico‐chemical studies on aqueous solutions and in solid state of new heteropolytungstates with one or two metal ions (Fe, Ni, Zn) in the anion are presented. The complexes are of particular structural and synthetic interest. The heteropolytungstates with two different metal ions in the anion are the first complexes of his type studied.
Results of X ray powder analysis and of pyknometer densities determination applied to trhe ammonium and potassium salts of ;t new heteropolytungstic anion with two different transition metal ions in the anion are reported. On the basis of the molecular weight valuies calculated from the experimental data, a 11-heteropolytungstic formula is ascribed to these salts. X ray powder data for the free acid H, [FeW,,O,,] are given.
Inhaltsiib ersichtRs werden die Ergebnisse der Riintgenpulveranaly-se und der pyknometrischen Dichtebestimmung fiir die Bmmonium-und Kaliumsalze eines neuen Heteropolyanions mit zwei verschiedenen Ubergangsmetallionen beschrieben. Auf Grund der aus experimentellen Sngaben berechneten Molckulargewichte wurden dic Kornplexe als 11-Heteropolywolframate formilliert. Rontgenangaben fiir die freie Xaure H, [FeW,,O,,] werden gegeben.In previous w o r k~l -~) we have reported about a new heteropolytungstic anion formulated :[NiFeW,,0,,]7-
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