Rare earth complexes with 4-methylmorpholine-N-oxide -: Synthesis, characterization and kinetics of thermal decomposition

被引：0

作者：

Pedrosa, AMG ^{[1
]}

Câmara, MSC ^{[1
]}

Borges, FMM ^{[1
]}

de Souza, HKS ^{[1
]}

Scatena, H ^{[1
]}

Melo, DMA ^{[1
]}

Zinner, LB ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Norte, Dept Chem, BR-59078970 Natal, RN, Brazil

来源：

JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2003年 / 73卷 / 03期

关键词：

kinetics; 4-methylmorpholine-N-oxide; rare earth complexes; thermal decomposition; trifluoroacetates;

D O I：

暂无

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Complexes of rare earth trifluoroacetates (TFA) with 4-methylmorpholine-N-oxide (MMNO) of composition Ln(TFA)(3).3MMNO (Ln=Eu, Dy, Ho, Er, Yb and Y) were synthesized and characterized by elemental analysis data, complexometric titration with EDTA, IR absorption spectra, thermogravimetric analyses and differential scanning calorimetry (DSC) in N-2 atmosphere. Infrared spectroscopy data revealed that the MMNO molecules are bound to the central ion through the oxygen of NO groups. These data suggest that the trifluoracetate groups are also coordinated. Thermogravimetric curves indicate that the decomposition of MMNO begins at approximately 350 K and results in Ln(2)O(3) residue at around 1170 K. A theoretical kinetic study was carried out using a QBASIC program with the TG input data for the Dy complex.

引用

页码：895 / 902

页数：8

共 16 条

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