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《JOURNAL OF PETROCHEMICAL UNIVERSITIES》 1999-04
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Synthesis and Characterization of Nonatungstodimolybdoniobogermanic Heteropoly Acid and Its Potassium with Keggin Structure

Hu Guoqiang 1, Xu Shengxian 1 (1.Department of Basic Courses, Liaoyang petrochemical Institute, Liaoning Liaoyang 111003, China; Wu Qingyin 2, Song Yulin 2 2.Deparatment of Chemistry, Liaoning University, Liaoning Shenyang 110036, China)  
The H 5GeW 9Mo 2NbO 40 ·H 2O and K 5GeW 9Mo 2NbO 4·H 2O heteropoly complex were prepared with 1:9 series unsaturated tungstogermanic heteropoly anion. The IR spectra show that each vibrational frequency of these two heterogoly complexes shifts to lower energies when increasing the number of molybdic (or niobic) atoms, and the vibrational frequency of potassium salt is 5 cm -1 lower than its mother acid. Two independent intense absorption bands appear at 200.5 and 264.2 nm. The characteristic diffraction peaks appear at the following ranges about 2θ angles:6~11°,16~22°,25~30°,33~38°,which shows that these two products have Keggin structure. The thermal analysis exhibites that exothermic peak temperature of potassium salt is 10℃ higher than its mother acid, which shows that the thermostability of potassium salt is higher. The first semiwave potential of possium salt is 0.02 V lower than its mother acid, which shows that the oxidation is lower than its mother acid.
【Fund】: 国家自然科学基金
【CateGory Index】: O641.4
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