Paper Title:
Synthesis and Kinetic Study by Ozawa Method of the Thermal Decomposition of Complexes Ln(thd)3phen
  Abstract

Recently, highly luminescent lanthanide complexes with mixed ligands such as and β-diketone and two herobiaryl ligands have been synthesized and suggested as promising light-conversion molecular devices as described by several authors. The synthesis, luminescence, quantum yields, spectroscopic characteristics, structure, among others properties of these complexes, including the possibility of production thin film films from these materials have been discussed, but little is known about their thermal decomposition kinetics. In this work we report the determination of kinetic parameters of thermal decomposition of the complexes Gd(thd)3phen and Er(thd)3phen (thd=2,2,6,6-tetramethyl-3,5- heptanodione; phen=1,10-phenantroline) using the method proposed by Ozawa (1965). The kinetic parameters obtained for activation energy were: 90 and 87 kJ.mol-1, the values of frequency factor were: 2.3x107 and 2.0x107 s-1 for Gd(thd)3phen and Er(thd)3phen, respectively. On the kinetic energy of the complexes, we notice the following order in thermal stability: Gd(thd)3phen < Er(thd)3phen.

  Info
Periodical
Materials Science Forum (Volumes 530-531)
Edited by
Lucio Salgado and Francisco Ambrozio Filho
Pages
513-519
DOI
10.4028/www.scientific.net/MSF.530-531.513
Citation
W. S. Lopes, C. R. da Silva Morais, A.G. de Souza, "Synthesis and Kinetic Study by Ozawa Method of the Thermal Decomposition of Complexes Ln(thd)3phen", Materials Science Forum, Vols. 530-531, pp. 513-519, 2006
Online since
November 2006
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