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.
The thermal behaviour of some heteropolytungstates of the 2:11 series was studied by means of T.G. and D.T.A. measurements, I.R. spectrometry and X‐ray powder analysis (DEBYE‐SCHERRER method).
The paper reports about the thermal behaviour of K6[HaSiNiW11O40]. 15 H2O in the 20–800°C range, studied by means of the T.G. and D.T. analysis, powder X ray analysis and I.R. spectrometry.
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