Journal of thermal analysis

, Volume 32, Issue 3, pp 737–748 | Cite as

Structure and thermal characterization of tris-thallium(III) glycollate

  • P. V. Khadikar
Article

Abstract

The thermal decarboxylation of Tl(GLA)3 (where GLA stands for the anion of glycollic acid) was studied by TG, DTG and DTA techniques. The results showed the escape of all three glycollic acid moieties in a single step. The IR spectra of the ligand and the complex indicated the bidentate character of carboxylate ion and the fact that the proton from the hydroxy group is not replaced during complex formation. The various kinetic and thermodynamic parameters were estimated from analysis of the TG, DTG and DTA curves of the sample, employing several computational methods. Precise results were then obtained by the method of least squares and are discussed.

Zusammenfassung

Die thermische Decarboxylierung von Tl(GLA)3 (GLA=Anion der Glykolsäure) wurde mittels TG, DTG und DTA untersucht. Alle drei Glykolsäureteile treten in einem einzigen Schritt aus. IR Spektren der Liganden und Komplexes weisen auf einen zweizähligen Charakter des Carboxylat-ions und darauf hin, daß das Proton der Hydroxylgruppe während der Komplexbildung nicht ersetzt wird. Die verschiedenen kinetischen und thermodynamischen Parameter der Probe wurden unter Anwendung einiger Berechnungsmethoden bestimmt. Genauere, durch die Methode der kleinsten Fehlerquadrate erhaltene Ergebnisse werden diskutiert.

Резюме

Методом ТГ, ДТГ и ДТА из учено термическое декарбоксилировани е соли гликолевой кислоты с трехвалентным талли ем. Результаты показали, что выделение всех тр ех остатков гликолевой кислоты происходит в одну стадию. ИК спектры свободног о лиганда и комплекса показали б идентатный характер карбоксилат-иона и от сутствие замещения в одородов гидроксильной групп ы при комплeксообразо вании. Анализ кривых ТГ, ДТГ и ДТА, проведенный с исполь зованием нескольких расчетных методов, позволил опр еделить различные кинетические и термо динамические параме тры. Проведено обсуждени е результатов, полученных по методу наименьших квадрато в.

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Copyright information

© Wiley Heyden Ltd., Chichester and Akadémiai Kiadó, Budapest 1987

Authors and Affiliations

  • P. V. Khadikar
    • 1
  1. 1.Department of ChemistryD.A.V.V., Vigyan BhavanIndoreIndia

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