THERMOANALYTICAL AND MASS-SPECTROMETRIC STUDIES ON VOLATILE BETA-DIKETONE CHELATES

被引：41

作者：

LESKELA, M ^{[1
]}

NIINISTO, L ^{[1
]}

NYKANEN, E ^{[1
]}

SOININEN, P ^{[1
]}

TIITTA, M ^{[1
]}

机构：

[1] HELSINKI UNIV TECHNOL,INORGAN & ANALYT CHEM LAB,SF-02150 ESPOO,FINLAND

来源：

THERMOCHIMICA ACTA | 1991年 / 175卷 / 01期

关键词：

D O I：

10.1016/0040-6031(91)80250-M

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Thd-chelates (thd = 2,2,6,6-tetramethyl-3,5-heptanedione) of Y, Ce, Pr, Sm, Eu, Gd, Tb, Tm and Yb and hexafluoroacetylacetonates (hfa) of Pr and Eu were studied by TG, DSC and MS techniques. TG and DSC curves of the complexes indicated the sublimation between 100 and 300-degrees-C. According to the DSC measurements the sublimation temperatures of rare earth thd chelates decrease with the cation size being 223-degrees-C for Pr and 170-degrees-C for Yb. The sublimation temperatures of fluorine containing complexes were 100 degrees lower than those of thd-chelates. The mass spectra of the rare earth-thd chelates were very similar. The main peak in each spectrum corresponded Ln(thd)2. The alkaline earth-thd chelates exist as M2(thd)3 species in the UHV conditions. The strongest peaks in the MS of the fluorocomplexes were the following: Pr(hfa)3.H2O and Eu(hfa)3.DMF.

引用

页码：91 / 98

页数：8

共 19 条

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