A QUANTITATIVE ESR STUDY OF Mo5+ FORMED ON DODECAMOLYBDOPHOSPHORIC ACID

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Abstract
The esr signal of Mo5+ on reduced 12-molybdophosphoric acid was found to be significantly affected by the degree of hydration, the degree of reduction (DR) and recording temperature. The spin concentrations of samples with low DR ( < 1 e/anion) could quantitatively be measured when the relaxation time of Mo5+ was made sufficiently large by sample evacuation at 300°C followed by recording at −100°C. For samples with DR > 1 e/anion the dilution of reduced anions with unreduced ones was effective. It was suggested that the interaction between Mo5+ ions within a polyanion remains weak even when 4 Mo5+ are produced in a polyanion.