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The enthalpies of formation and evolved gas detection

H4SiW12O40·6H2O and its DMF and DMSO adducts

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Abstract

The standard molar enthalpies of formation of H4SiW12O40·6H2O (I), H4SiW12O40·6DMF·H2O (II), H4SiW12O40·8DMSO·H2O (III) have been determined. Thermodynamic cycles were designed, and the heat of reactions in the thermodynamic cycles were measured calorimetrically. The infrared spectra were compared with those of the heteropoly anion α-H4SiW12O40 [1] and of the ligands DMF and DMSO. The evolved gas from the adducts was monitored by a quadrupole mass spectrometer at a heating rate of 16 deg·min−1.

Zusammenfassung

Die molaren Standardenthalpien der Bildung von H4SiW12O40·6H2O (I), H4SiW12O40·6DMF·H2O (II) und H4SiW12O40·8DMSO·H2O (III) wurden ermittelt. Es wurden thermodynamische Kreisläufe konstruiert und die Reaktionswärme der thermodynamischen Kreisläufe kalorimetrisch gemessen. Die IR-Spektren wurden mit dem des heteropolaren Anions H4SiW12O40 [1] und mit denen der Liganden DMF und DMSO verglichen. Das aus den Addukten freigesetzte Gas wurde über ein Quadrupol-Massenspektrometer bei einer Aufheizgeschwindigkeit von 16 grad/min verfolgt.

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Authors and Affiliations

  1. Department of Chemistry, Fudan University, 200433, Shanghai, P. R. China

    Xian'e Cai, Daichun Du, Youming Jin & Jing Zhu

  2. Shanghai Institute of Chemical Technology, 200233, Shanghai, P. R. China

    Meiling Huang

  3. Scientific Research Institute of Fragrance & Flavor, 200031, Shanghai, P. R. China

    Zemin Lin

Authors
  1. Meiling Huang
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  2. Xian'e Cai
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  3. Daichun Du
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  4. Youming Jin
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  5. Jing Zhu
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  6. Zemin Lin
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Huang, M., Cai, X., Du, D. et al. The enthalpies of formation and evolved gas detection. Journal of Thermal Analysis 45, 69–77 (1995). https://doi.org/10.1007/BF02548665

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