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After a brief discussion on the output capacity of the methods used for the study of the isopolymetalates, a classification and characterization of the solid isopolymolybdates obtainable from aqueous solution is given, and the relation of the solid isopolymolybdates to the isopolymolybdate ions in solution is studied. A correlation between the occurrence or non-occurrence of a species in a solid and in its solution detectable by Raman spectroscopy, the solubility of the solid, and the time necessary for the formation of the solid was found. This gives important informations on the mechanisms of formation of the isopolymetalate ions. The most remarkable result of this investigation is that contrary to the view of the majority of the papers on this subject the octamolybdate ion Mo 8 O 26  4-  having the structure found by LINDQVIST does not occur in important quantities in solution at room temperature. For setting up a reaction scheme on the isopolymolybdates only very few of the confusing multiplicity of the papers give evidentiary informations. Most of the papers are overinterpreted.

zeitschrift für naturforschung b

Über Isopolymolybdatfeststoffe und deren Beziehung zu Isopolymolybdationen in wäßriger Lösung / Concerning Solid Isopolymolybdates and their Relation to Isopolymolybdate Ions in Aqueous Solution