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The thermal properties of some metal complexes of diethyldithiocarbamic acid new volatile metal chelates

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Abstract

The cobalt(II), nickel(II), copper(II), zinc(II), cadmium(II), silver(I) and mercury(II) complexes of diethyldithiocarbamic acid were prepared and their thermal properties determined by TG, DTA, and high temperature reflectance spectroscopy. It was found that the copper(II), nickel(II), and zinc(II) chelates were completely volatile and thus represent a new class of volatile metal chelates. Vapor pressure measurements were made on four of the metal complexes; heats of vaporization ranged from 9.3±0.2 kcal/mole for Na[Co(DDC)3] to 24.2±0.6 kcal/mole for Zn(DDC)2.

Résumé

On a préparé les complexes de cobalt(II), nickel(II), cuivre(II), zinc(II), cadrnium(II), argent(I) et mercure(II) avec l'acide diéthyle-dithiocarbaminique et étudié leurs propriétés thermiques par TG, ATD et spectroscopie de reflexion à haute température. On a trouvé que les complexes de cuivre(II), nickel(II) et zinc(II) volatilisent parfaitement; ils représentent une nouvelle sorte de chélates métalliques volatiles. On a fait des mesures de pression de vapeur sur quatre de ces complexes. Les valeurs des chaleurs de vaporisation s'étalent de 9.3±0.2 kcal/mole pour Na[Co(DDC)3] jusqu'à 24.2±0.6 kcal/mole pour Zn(DDC)2.

Zusammenfassung

Es wurden die Komplexe von Kobalt(II), Nickel(II), Kupfer(II), Zink(II), Cadmium(II), Silber(I) und Quecksilber(II) mit Diäthyldithiokarbaminsäure hergestellt und ihre thermischen Eigenschaften durch Thermogravimetrie, Differentialthermoanalyse und Hochtemperatur Reflexions Spektroskopie untersucht. Man fand, daß die Kupfer(II)-, Nickel(II)- und Zink(II)-Komplexe vollständig verflüchtigen. Sie stellen eine neue Sorte flüchtiger Metallchelate dar. Dampfdruckmessungen wurden an vier der Komplexe unternommen. Die Verdampfungswärmen liegen zwischen den Werten von 9.3±0.2 Kcal/Mol für Na[Co(DDC)3] bis 24.2±0.6 Kcal/Mol für Zn(DDC)2.

Резюме

Синтезированы компл ексы кобальта [II], никке ля [II], меди [II], цинка [II], кадмия [II], серебра [I] и рту ти [II] с диэтилдитиокарбами новой кислотой и опре делены их термические свойств а методами ТГ, ДТА и спе ктроскопии отражения при высоко й температуре. Найдено, что хелаты ме ди [II], никеля и цинка [II] яв ляются летучими соединения ми — представителями но вого класса летучих х елатов металлов. Измерено да вление пара для четырëх мета лл-комплексов; теплот а испарения колеблется в интерва лах 9,3±0,2 ккал/моль для Na[Co(DDC)3] и 24,2±0,6 кк ал/моль для Zn[DDC]2.

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Author notes

  1. G. D'Ascenzo

    Present address: Chemical Institute, University of Rome, Rome, Italy

Authors and Affiliations

  1. Thermochemistry Laboratory, Department of Chemistry, University of Houston, Houston, Texas, USA

    G. D'Ascenzo & W. W. Wendlandt

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  1. G. D'Ascenzo
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  2. W. W. Wendlandt
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Additional information

The partial support of this work by the U. S. Air Force, Air Force Office of Scientific Research, through Grant No. AF-AFOSR 69-1620, is gratefully acknowledged. One of us (G. D'A.) wishes to thank the National Research Council of Italy, Rome, Italy, for financial support.

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D'Ascenzo, G., Wendlandt, W.W. The thermal properties of some metal complexes of diethyldithiocarbamic acid new volatile metal chelates. Journal of Thermal Analysis 1, 423–434 (1969). https://doi.org/10.1007/BF01983084

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  • DOI: https://doi.org/10.1007/BF01983084

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