Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Transient Isomers of the Undecatungstomolybdo(V)phosphate and -silicate Anions

  • Published : 1984.04.20
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Abstract

Reactions of $MoOCl_5^{2-}$ with $[PW_{11}O_{39}]^{7-}\;and\;[SiW_{11}O_{39}]^{8-}$ have been studied spectrophotometrically and several transient complexes have been discovered. Transient species initially formed are probably $[Mo_2O_4(PW_{11}O_{39})_2]^{12-}\;and\;[Mo_2O_4(SiW_{11}O_{39})_2]^{14-}$. Spectra change gradually, indicating formation of transient isomers of $[PMoW_{11}O_{40}]^{4-}\;and\;[SiMoW_{11}O_{40}]^{5-}$, which again transform into the stable isomers. The transient isomers absorb light much more strongly than the stable isomers in the visible range.

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References

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  17. However, the isosbestic point that appears during the evolutio of Spectrum A is less clearly seen at this PH. Moreover, the stable isomer of [PMoW$_11$O$_40$]$^{4-}$ is believed to disproportionate at PH${\ge}$2. See Reference 2. These are the reasons why we present the spectra at PH 1.1 in Figures 1 and 2.
  18. The molybdenum complexes that contribute to Spectrum A at 20.2 kK and their molar abso(${\varepsilon}$${\varepsilon}$>3040). Complex B ((${\varepsilon}$980). and[Mo($_2$O$_4$(PW($_{11-}$O($_39$)$_2$]($^{12-}$(${\varepsilon}$/2<170 dm>$^3$ mol>$^{-1}$cm$^{-1}$). The last comples is discussed later in the text.