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Speciation of isopolymolybdate(VI) in a highly concentrated HNO$$_{3}$$ solution by Raman and EXAFS spectroscopies

Saeki, Morihisa*; Yomogida, Takumi  ; Matsumura, Daiju  ; Saito, Takumi*; Nakanishi, Ryuzo*; Tsuji, Takuya ; Okamoto, Yoshihiro ; Oba, Hironori*

Speciation of isopolymolybdates in a highly concentrated HNO$$_{3}$$ solution was investigated by Raman spectroscopy and Mo K-edge extended X-ray absorption fine structure (EXAFS). A series of Raman spectra and EXAFS oscillations were analyzed using Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS). The MCR-ALS analysis gives us the fraction profile in change of [Mo$$_{36}$$O$$_{112}$$(H$$_{2}$$O)$$_{16}$$]$$^{8-}$$$$rightarrow$$[Mo$$_{2}$$O$$_{5}$$]$$^{2+}$$$$rightarrow$$[MoO$$_{2}$$]$$^{2+}$$ with the increase of the HNO$$_{3}$$ concentration.



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