Thermal decomposition of palladium(II) pyrazolyl complexes; Part II

被引：0

作者：

A. V. G. Netto

A. M. Santana

A. E. Mauro

Regina C. G. Frem

E. T. de Almeida

M. S. Crespi

H. E. Zorel Jr.

机构：

[1] Instituto de Química de Araraquara,

[2] UNESP,undefined

[3] Instituto de Química de Araraquara,undefined

[4] UNESP,undefined

[5] Instituto de Química de Araraquara,undefined

[6] UNESP,undefined

[7] Instituto de Química de Araraquara,undefined

[8] UNESP,undefined

[9] Universidade Católica de Brasília,undefined

[10] UCB,undefined

[11] Instituto de Química de Araraquara,undefined

[12] UNESP,undefined

[13] Faculdades Integradas Católicas de Palmas,undefined

来源：

Journal of Thermal Analysis and Calorimetry | 2005年 / 79卷

关键词：

TG; DTA; palladium(II); pseudohalides; pyrazoles;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

In this work the synthesis and determination of kinetic parameters of thermal decomposition of the complexes Gd(thd)<Subscript>3</Subscript>phen and Gd(thd)<Subscript>3</Subscript>bipy (where <Emphasis Type=”Italic”>thd</Emphasis>=2,2,6,6-tetramethyl-3,5-heptanodione; phen=1,10-phenantroline and bipy=2,2-dipyridine) by non-isothermal thermogravimetry is reported. The kinetic parameters of activation energy, reaction order and frequency factor were obtained from the thermogravimetric data by non-isothermal integral methods proposed by Coats-Redfern and Madhusudanan, as well as by approximation methods proposed by Horowitz-Metzger and Van Krevelen. The kinetic model that best described the thermal decomposition reaction for the two complexes was R1 indicating that the mechanism is controlled by one-dimensional phase-boundary (zero order) and is defined by the function g(&agr;)=1-(1-&agr;). Based on the values of activation energy obtained by Coats-Redfern method, the following order in the thermal stability was noticed: Gd(thd)<Subscript>3</Subscript>phen<Gd(thd)<Subscript>3</Subscript>bipy.

引用

页码：339 / 342

页数：3