On the thermal decompositions of the trivalent trioxalato complexes of Al, Cr, Mn, Fe and Co

被引：0
|
作者：
Rajić N. [1 ]
Stojakovic D. [1 ]
Gabrovšek R. [2 ]
机构：
[1] Faculty of Technology and Metallurgy, University of Beograd
[2] National Institute of Chemistry, S1-1001 Ljubljana
来源：
Journal of Thermal Analysis and Calorimetry | 2001年 / 63卷 / 01期
关键词：
Aluminum - Chemical bonds - Chromium - Cobalt - Complexation - Dehydration - Iron - Manganese - Potassium compounds - Quantum theory - Thermodynamic properties - Thermogravimetric analysis;
D O I：
10.1023/A:1010152907304
中图分类号：
学科分类号：
摘要：
The thermal decompositions of the complexes K3[M(ox)3]·3H2O (M=Al, Cr, Mn, Fe, Co; ox=C2O42) were studied. Dehydration of the complexes occurs up to 200°C, this being a three-step process for M=Al, Cr, Mn and Co, and a two-step process for M=Fe. Decomposition of the dehydrated complexes proceeds in several steps. For M=Al, Cr and Fe, the decomposition takes place with the evolution of CO, whereas for M=Mn and Co the decomposition of the oxalate ligand yields solid C besides CO. The temperature of CO liberation decreases in the series Cr<Al<Co<Mn<Fe. For M=transition metal, this trend can be explained by the fact that the strength of the C-C bond in the oxalate ligand decreases in the series Cr<Co<Mn<Fe.
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页码：191 / 195
页数：4
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