Thermal decomposition kinetics of vanillidene anthranilic acid complexes of cobalt(II), nickel(II), copper(II) and zinc(II) |
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Authors: | J Chacko G Parameswaran |
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Institution: | (1) Department of Chemistry, University of Calicut, India |
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Abstract: | The thermal decomposition of cobalt(II), nickel(II), copper(II) and zinc(II) complexes of the Schiff base vanillidene anthranilic acid was studied by TG. The chelates show somewhat similar TG plots when heated in an atmosphere of air. Thermoanalytical data (TG and DTG) of these chelates are presented in this communication. Interpretation and mathematical analysis of these data and evaluation of order of reaction, the energy and entropy of activation based on the differential method employing the Freeman-Carroll equation, the integral method using Coats-Redfern equation and the approximation method using the Horowitz-Metzger equation are also given. On the basis of experimental findings in the present course of studies, it is concluded that the relative thermal stability of vanillidene anthranilic acid chelates can be aligned as Co(II) Ni(II)>Zn(II)>Cu(II).
Zusammenfassung Die thermische Zersetzung von Cobalt(II)-, Nickel(II)-, Kupfer(II)- und Zink(II)-Komplexen der Schiffschen Base Vanillidenanthranilsäure wurde thermogravimetrisch untersucht. Die Chelate zeigen in einer Luftatmosphäre ähnliche TG-Kurven. Thermoanalytische Daten (TG and DTG) dieser Chelate werden mitgeteilt, interpretiert und mathematisch analysiert. Ebenfalls werden die Reaktionsordnung und die Energie und Entropie der Aktivierung nach der von Freeman-Carroll angewandten differentiellen Methode, nach der auf der Coats-Redfern-Gleichung basierenden integralen Methode und nach der die Horowitz-Metzger Gleichung benutzenden Näherungsmethode bestimmt. Aus den Befunden wird geschlossen, dass die thermische Stabilität von Vanillidenanthranilsäure-Chelaten in der Reihenfolge Co(II) Ni(II)>Zn(II)> >Cu(II) abnimmt.
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![scy](/content/g738526527510850/xxlarge1089.gif) ![pcy](/content/g738526527510850/xxlarge1087.gif) ![ocy](/content/g738526527510850/xxlarge1086.gif) ![lcy](/content/g738526527510850/xxlarge1083.gif) ![ocy](/content/g738526527510850/xxlarge1086.gif) ![zhcy](/content/g738526527510850/xxlarge1078.gif) ![iecy](/content/g738526527510850/xxlarge1077.gif) ![ncy](/content/g738526527510850/xxlarge1085.gif) ![rcy](/content/g738526527510850/xxlarge1088.gif) ![yacy](/content/g738526527510850/xxlarge1103.gif) ![Scy](/content/g738526527510850/xxlarge1057.gif) ![ocy](/content/g738526527510850/xxlarge1086.gif) Ni>Zn>u.
We thank Dr. C. P. Savariar, Professor of Chemistry, University of Calicut for encouragement. We are also grateful to the University Grants Commission for the award of a Senior Research Fellowship to one of us (J. C). |
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