Studies on niobium and tantalum
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It has been found that in aqueous solutions, on vigorous boiling, the 2-tartrato-2-niobates and the corresponding free acid are degraded, giving rise to new complexes of niobium. The conditions of formation and the mechanism of the reaction have been studied. Adequate explanation has been offered for the phenomenon. The compounds are regarded as polynuclear complexes and suitable structures are given for the compounds prepared.