caa a22 4500 463192818 CHVBK 20180406164914.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10973-006-7785-x doi (NATIONALLICENCE)springer-10.1007/s10973-006-7785-x Studyof isothermal decomposition of lanthanide mixed complexes with 2,2,6,6-tetramethyl-3,5-heptanodioneand 1,10-phenanthroline [Elektronische Daten] [W. Lopes, Crislene Morais, A. Souza, V. Leite, B. de A. Firmo] 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+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)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. Springer-Verlag, 2007 activation energy nationallicence β-diketone nationallicence isothermal kinetic nationallicence lanthanide nationallicence mixed complexes nationallicence Lopes W. Departamento de Química, Centro de Ciências e Tecnologia, Universidade Estadual da Paraíba, 58109-790, Bodocongó, Campina Grande, PB, Brazil aut Morais Crislene Departamento de Engenharia de Materiais, Centro de Ciências e Tecnologia, Universidade Federal de Campina Grande, 58109-970, Bodocongó, Campina Grande, PB, Brazil aut Souza A. LTM, Departamento de Química, Centro de Ciências Exatas e da Natureza, Universidade Federal da Paraíba, Cidade Universitária, 58059-900, João Pessoa, PB, Brazil aut Leite V. Departamento de Química, Centro de Ciências e Tecnologia, Universidade Estadual da Paraíba, 58109-790, Bodocongó, Campina Grande, PB, Brazil aut de A. Firmo B. Departamento de Química, Centro de Ciências e Tecnologia, Universidade Estadual da Paraíba, 58109-790, Bodocongó, Campina Grande, PB, Brazil aut Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 841-845 1388-6150 87:3<841 2007 87 10973 https://doi.org/10.1007/s10973-006-7785-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10973-006-7785-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lopes W. Departamento de Química, Centro de Ciências e Tecnologia, Universidade Estadual da Paraíba, 58109-790, Bodocongó, Campina Grande, PB, Brazil aut NATIONALLICENCE 700 1- Morais Crislene Departamento de Engenharia de Materiais, Centro de Ciências e Tecnologia, Universidade Federal de Campina Grande, 58109-970, Bodocongó, Campina Grande, PB, Brazil aut NATIONALLICENCE 700 1- Souza A. LTM, Departamento de Química, Centro de Ciências Exatas e da Natureza, Universidade Federal da Paraíba, Cidade Universitária, 58059-900, João Pessoa, PB, Brazil aut NATIONALLICENCE 700 1- Leite V. Departamento de Química, Centro de Ciências e Tecnologia, Universidade Estadual da Paraíba, 58109-790, Bodocongó, Campina Grande, PB, Brazil aut NATIONALLICENCE 700 1- de A. Firmo B. Departamento de Química, Centro de Ciências e Tecnologia, Universidade Estadual da Paraíba, 58109-790, Bodocongó, Campina Grande, PB, Brazil aut NATIONALLICENCE 773 0- Journal of Thermal Analysis and Calorimetry Kluwer Academic Publishers 87/3(2007-03-01), 841-845 1388-6150 87:3<841 2007 87 10973 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer