Temperature dependence vapour pressure measurements of Mg(tmhd)2(tmeda) [(tmhd=2,2,6,6-tetramethyl-3,5-heptanedione, tmeda = N,N,N',N'-tetramethylethylenediamine]

被引：13

作者：

Maria, Mathew ^{[1
]}

Selvakumar, J. ^{[1
]}

Raghunathan, V. S. ^{[2
]}

Mathews, Tom ^{[3
]}

Nagaraja, K. S. ^{[1
]}

机构：

[1] Loyola Coll, Dept Chem, Loyola Inst Frontier Energy, Madras 600034, Tamil Nadu, India

[2] Non Ferrous Mat Technol Dev Ctr, Hyderabad 500050, Andhra Pradesh, India

[3] Indira Gandhi Ctr Atom Res, Div Mat Sci, Kalpakkam 603102, Tamil Nadu, India

来源：

THERMOCHIMICA ACTA | 2008年 / 474卷 / 1-2期

关键词：

Mg complexes; beta-diketonate; TG transpiration vapour pressure; sublimation enthalpy and entropy; DTA fusion study;

D O I：

10.1016/j.tca.2008.04.020

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The reaction between the magnesium beta-diketonate complex Mg(tmhd)(2)(H2O)(2) and 1 equiv. of N,N,N',N'-tetramethylethylenediamine (tmeda=Me2NCH2CH2NMe2) in hexane at room temperature yielded Mg(tmhd)(2)(tmeda). The standard enthalpy of sublimation (83.2 +/- 2.3 kJ mol(-1)) and entropy of sublimation (263 +/- 6.3 J mol(-1) K-1) of Mg(tmhd)(2)(tmeda) were obtained from the temperature dependence vapour pressure, determined by adopting a horizontal dual arm single furnace thermogravimetric analyser as a transpiration apparatus. From the observed melting point depression DTA, the standard enthalpy of fusion (58.3 +/- 5.2 kJ mol(-1)) was evaluated, using the ideal eutectic behaviour of Mg(tmhd)(2)(tmeda) as a solvent with bis(2,4-pentanedionato)magnesium(II), Mg(acac)(2) as a non-volatile solute. (c) 2008 Elsevier B.V. All rights reserved.

引用

页码：87 / 90

页数：4

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