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A study of the dehydratation kinetics of binuclear EDTA chelates CaML · nH2O

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Abstract

Dehydratation kinetics of aquo-acido complex EDTA chelates CaML · nH2O (M= =Mn, Co, Ni, Cu, Zn, Cd, Ca,n=2 ... 5) were studied under non-isothermal conditions. The existence of two isokinetic temperatures (β 1=42°,β 2=216°) has been detected with a reliability of 95 %. The compensation effect found is explained by the change in the number of bonds formed in the sequence of equal-type dehydratation reactions of analogously built-up, but not isostructural compounds.

Résumé

On a étudié, dans des conditions non-isothermes, la cinétique de déshydration des chélates complexes aquo-acides de l'EDTA de type CaML ·n H2O (M=Mn, Co, Ni, Cu, Zn, Cd, Ca;n=2 ... 5). On a établi, avec une probabilité de 95 %, l'existence de deux températures isocinétiques (β 1=42°,β 2=216°). L'effet de compensation trouvé s'explique par le changement du nombre des liaisons formées lors des réactions de déshydratation de type similaire des composés de composition analogue mais non isostructuraux.

Zusammenfassung

Die Dehydratisierungskinetik der Aquo-Acido-Komplexe der EDTA-Chelate CaML ·n H2O (M=Mn, Co, Ni, Cu, Zn, Cd, Ca,n=2 ... 5) wurde unter nichtisothermen Bedingungen untersucht. Die Existenz zweier isokinetischer Temperaturen (β 1= =42°,β 2=216°) wurde mit einer Wahrscheinlichkeit von 95 % festgestellt. Der festgestellte Kompensationseffekt wird durch die Änderung der Zahl der im Laufe der Dehydratisierungsreaktionen ähnlichen Typs analog zusammengesetzter, doch nicht isostruktureller Verbindungen entstandenen Bindungen, erklärt.

Резюме

Кинетика дегидратац ии халатов ЭДТА (акво-ацидо-комплексо в) CaML.nH2O (M=Mn, Co, Ni, Cu, Zn, Cd, Ca;n=2...5). изучена в неи зотермических условиях. С 95% надежностью показан о существование двух изокинетических тем ператур (β 1=42 °C,β 2=216 °C). Обнаруженный ко мпенсационный эффек т объясняется изменен ием количества образующихся связей в ряду однотипных реа кций дегидратации аналог ично построенных, но неизоструктурных соединений.

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Authors and Affiliations

  1. Siberian Department of the Academy of Sciences of the U.S.S.R., Institute of Inorganic Chemistry, Novosibirsk, U. S. S. R.

    V. A. Logvinenko & L. I. Myachina

Authors
  1. V. A. Logvinenko
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  2. L. I. Myachina
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Logvinenko, V.A., Myachina, L.I. A study of the dehydratation kinetics of binuclear EDTA chelates CaML · nH2O. Journal of Thermal Analysis 19, 45–50 (1980). https://doi.org/10.1007/BF01928429

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  • DOI: https://doi.org/10.1007/BF01928429

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