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Na2WO4¡¤2H2O, Na2HPO4¡¤12H2O, and Co(NO3)
2¡¤6H2O were mixed in 100 mL of deionized
water. After adjusting the pHvalue from9 to 7 by dropping HCl aqueous
solution (36 wt.%, SCRC), this suspension was refluxed at 100 ¡ãC for 2 h.
Then, a dark purple solution was obtained by filtering at 100 ¡ãC. After
cooling to room temperature, purple crystals were collected. The obtained
crystals were denoted as Na7H10[Co6(H2O)2(PW9O34)2(PW6O26)]¡¤30 H2O.
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