Thermogravimetric study of DMF loss from (C8H11NH)4W10O32·2DMF |
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Authors: | C Santiago A R Arnaiz L Lorente J M Arrieta M A Martinez |
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Institution: | (1) Dpto. De Quimica Inorganica, Facultad de Ciencias, Universidad Del Pais Vasco, Aptdo. 644, Bilbao, Espana |
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Abstract: | The thermal behaviour of collidinium decatungstate with twoN,N-dimethylformamide (DMF) crystallization molecules was studied by thermogravimetry. The kinetic parameters for the first stage of the thermal decomposition were established from isothermal and nonisothermal mass-change studies. The chemical reaction in this step is the loss of DMF: as confirmed by1H NMR.The physical model of this reaction, nucleation-growth according to the Avrami-Erofeev law, withn=1/2, was found by comparison of the isothermal and non-isothermal TG data.
Zusammenfassung Das thermische Verhalten von Collidinium-dekawolframat mit zweiN,N-Dimethylformamid-Molekülen (DMF) wurde thermogravimetrisch untersucht. Die kinetischen Parameter des ersten Schrittes der thermischen Zersetzung wurden aus isothermen und nicht-isothermen Massenveränderungen ermittelt. Die in diesem Schritt verlaufende Reaktion ist der Verlust von DMF gemäßwie durch1H-NMR bestätigt wurde. Das physikalische Modell dieser Reaktion, nämlich ein Keimwachstum entsprechend dem Avrami-Erofeev-Gesetz mitn=1/2, wurde durch Vergleich der isothermen und nicht-isothermen TG-Daten gefunden.
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![ocy](/content/x57wu56l848g74g1/xxlarge1086.gif) ![Tcy](/content/x57wu56l848g74g1/xxlarge1058.gif) ![bcy](/content/x57wu56l848g74g1/xxlarge1073.gif) ![ycy](/content/x57wu56l848g74g1/xxlarge1099.gif) ![lcy](/content/x57wu56l848g74g1/xxlarge1083.gif) ![ncy](/content/x57wu56l848g74g1/xxlarge1085.gif) ![acy](/content/x57wu56l848g74g1/xxlarge1072.gif) ![jcy](/content/x57wu56l848g74g1/xxlarge1081.gif) ![dcy](/content/x57wu56l848g74g1/xxlarge1076.gif) ![iecy](/content/x57wu56l848g74g1/xxlarge1077.gif) ![ncy](/content/x57wu56l848g74g1/xxlarge1085.gif) , ![chcy](/content/x57wu56l848g74g1/xxlarge1095.gif) ![tcy](/content/x57wu56l848g74g1/xxlarge1090.gif) ![fcy](/content/x57wu56l848g74g1/xxlarge1092.gif) ![icy](/content/x57wu56l848g74g1/xxlarge1080.gif) ![zcy](/content/x57wu56l848g74g1/xxlarge1079.gif) ![icy](/content/x57wu56l848g74g1/xxlarge1080.gif) ![chcy](/content/x57wu56l848g74g1/xxlarge1095.gif) ![iecy](/content/x57wu56l848g74g1/xxlarge1077.gif) 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![chcy](/content/x57wu56l848g74g1/xxlarge1095.gif) ![icy](/content/x57wu56l848g74g1/xxlarge1080.gif) ![ncy](/content/x57wu56l848g74g1/xxlarge1085.gif) ![yacy](/content/x57wu56l848g74g1/xxlarge1103.gif) ![iecy](/content/x57wu56l848g74g1/xxlarge1077.gif) ![tcy](/content/x57wu56l848g74g1/xxlarge1090.gif) ![scy](/content/x57wu56l848g74g1/xxlarge1089.gif) ![zcy](/content/x57wu56l848g74g1/xxlarge1079.gif) ![acy](/content/x57wu56l848g74g1/xxlarge1072.gif) ![kcy](/content/x57wu56l848g74g1/xxlarge1082.gif) ![ocy](/content/x57wu56l848g74g1/xxlarge1086.gif) ![ncy](/content/x57wu56l848g74g1/xxlarge1085.gif) ![vcy](/content/x57wu56l848g74g1/xxlarge1074.gif) ![rcy](/content/x57wu56l848g74g1/xxlarge1088.gif) ![acy](/content/x57wu56l848g74g1/xxlarge1072.gif) ![mcy](/content/x57wu56l848g74g1/xxlarge1084.gif) -![IEcy](/content/x57wu56l848g74g1/xxlarge1045.gif) ![rcy](/content/x57wu56l848g74g1/xxlarge1088.gif) ![ocy](/content/x57wu56l848g74g1/xxlarge1086.gif) ![fcy](/content/x57wu56l848g74g1/xxlarge1092.gif) ![iecy](/content/x57wu56l848g74g1/xxlarge1077.gif) ![iecy](/content/x57wu56l848g74g1/xxlarge1077.gif) ![vcy](/content/x57wu56l848g74g1/xxlarge1074.gif) ![scy](/content/x57wu56l848g74g1/xxlarge1089.gif) =1/2.
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