NDLI: Study of isothermal decomposition of lanthanide mixed complexes with 2,2,6,6-tetramethyl-3,5-heptanodione and 1,10-phenanthroline

Content Provider	Springer Nature Link
Author	Lopes, W. S. Morais, Crislene R. S. Souza, A. G. Leite, V. D. de A. Firmo, B. D.
Copyright Year	2007
Abstract	Isothermal decomposition kinetic of three lanthanide mixed complexes with the general formula of Ln(thd)3phen (where Ln=Nd$^{3+}$, Sm$^{3+}$ or Er$^{3+}$, thd=2,2,6,6-tetramethyl-3,5-heptanodione and phen=1,10-phenanthroline) has been studied in this work. The powders were characterized by their melting point, elemental analysis, FTIR spectroscopy and thermogravimetry. The isothermal TG curves have been recorded under the same conditions at 265–285, 265–285 and 250–270°C for Nd(thd)$_{3}$phen, Sm(thd)$_{3}$phen and Er(thd)$_{3}$phen, respectively.The kinetic parameters, i.e. activation energy, reaction order and frequency factor were obtained through the technique of lineal regression using the relation g(α)=kt+g $_{0}$. The analysis was done at decomposed fractions between 0.10–0.90. The values of activation energy were: 114.10, 114.24 and 115.04 kJ mol$^{–1}$ for the Nd(thd)$_{3}$phen, Sm(thd)$_{3}$phen and Er(thd)$_{3}$phen complexes, respectively. The kinetic models that best described the isothermal decomposition reaction the complexes were R1 and R2. The values of activation energy suggests the following decreasing order of stability: Nd(thd)$_{3}$phen
Starting Page	841
Ending Page	845
Page Count	5
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	87
Issue Number	3
e-ISSN	15728943
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-03-07
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	activation energy β-diketone isothermal kinetic lanthanide mixed complexes Polymer Sciences Physical Chemistry Inorganic Chemistry Measurement Science, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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