Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 87: Issue 3
Study of isothermal decomposition of lanthanide mixed complexes with 2,2,6,6-tetramethyl-3,5-heptanodione and 1,10-phenanthroline
Authors:
W. Lopes Universidade Estadual da Paraíba Departamento de Química, Centro de Ciências e Tecnologia Bodocongó Brazil 58109-790 Campina Grande, PB

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Crislene Morais Universidade Federal de Campina Grande Departamento de Engenharia de Materiais, Centro de Ciências e Tecnologia Bodocongó Brazil 58109-970 Campina Grande, PB

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A. Souza Universidade Federal da Paraíba LTM, Departamento de Química, Centro de Ciências Exatas e da Natureza João Pessoa Brazil 58059-900 PB Cidade Universitária

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V. Leite Universidade Estadual da Paraíba Departamento de Química, Centro de Ciências e Tecnologia Bodocongó Brazil 58109-790 Campina Grande, PB

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B. de A. Firmo Universidade Estadual da Paraíba Departamento de Química, Centro de Ciências e Tecnologia Bodocongó Brazil 58109-790 Campina Grande, PB

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Pages:
841–845
Online Publication Date:
09 Mar 2007
Publication Date:
01 Mar 2007
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-006-7785-x
Keywords:
activation energy; β-diketone; isothermal kinetic; lanthanide; mixed complexes
Restricted access

Abstract  

Isothermal decomposition kinetic of three lanthanide mixed complexes with the general formula of Ln(thd)3phen (where Ln=Nd3+, Sm3+ or Er3+, 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)3phen, Sm(thd)3phen and Er(thd)3phen, 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+g0. 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)3phen, Sm(thd)3phen and Er(thd)3phen 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)3phen<Sm(thd)3phen<Er(thd)3phen.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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