The thermal decomposition temperatures of ionic metal oxalates |
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Authors: | I A Kahwa A M Mulokozi |
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Institution: | (1) Department of Chemistry, University of Dar es Salaam, P.O. Box 35061, Dar es Salaam, Tanzania |
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Abstract: | Previous investigations linking the thermal decomposition properties of metal oxalates to the nature of the bonding have been successful only in establishing qualitative relationships. A quantitative relation is now revealed permitting prediction of the thermal decomposition temperaturesT
d
(°C) of metal oxalates:T
d
=516–1.4006r
c
/r
i
![radic](/content/t47w20670k411166/xxlarge8730.gif) I wherer
c
/r
i
is the ratio of the Pauling covalent radius and the ionic radius of the metal atom in hexacoordination, and I
i
is the sum of the ionization potentials of the metal atom in kJ mol–1.
Zusammenfassung Frühere Untersuchungen über Beziehungen der Eigenschaften thermischer Zersetzung von Metalloxalaten in Bezug auf Bindungseigenschaften, waren nur hinsichtlich der Feststellung qualitativer Zusammenhänge erfolgreich. Es wurde ein quantitativer Zuhammenhang gefunden, welcher die Voraussage der thermischen ZersetzungstemperaturenT
d
(°C) der Metalloxalate gestattet:T
d
=516–1.4006r
c
/r
i
, ![radic](/content/t47w20670k411166/xxlarge8730.gif) I
i
wobeir
c
/r
i
das Verhältnis der Pauling'schen kovalenten Radiusen und des Ionenradius des Metallatoms in sechsfacher Koordination ist und I
i
die Summe des Ionisierungspotentials des Metallatoms in kJ·mol–1.
Résumé Les études antérieures qui reliaient les caractéristiques de la décomposition thermique des oxalates métalliques à la nature de la liaison sont restées limitées à des relations qualitatives. Une relation quantitative qui permet de prédire les températures de décomposition thermiqueT
d
(°C) des oxalates de métaux est présentée ici:T
d
=516–1.4006r
c
/r
i
, ![radic](/content/t47w20670k411166/xxlarge8730.gif) I
i
oùr
c
/r
i
est le rapport du rayon covalent de Pauling au rayon ionique de l'atome métallique hexacoordonné et I
i
la somme des potentiels d'ionisation de l'atome de métal en kJ·mol–1.
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d
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d
=516–1.4006r
c
/r
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i
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c
/r
i
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— ![scy](/content/t47w20670k411166/xxlarge1089.gif) ![ucy](/content/t47w20670k411166/xxlarge1091.gif) ![mcy](/content/t47w20670k411166/xxlarge1084.gif) ![mcy](/content/t47w20670k411166/xxlarge1084.gif) ![icy](/content/t47w20670k411166/xxlarge1080.gif) ![ocy](/content/t47w20670k411166/xxlarge1086.gif) ![ncy](/content/t47w20670k411166/xxlarge1085.gif) ![icy](/content/t47w20670k411166/xxlarge1080.gif) ![zcy](/content/t47w20670k411166/xxlarge1079.gif) ![acy](/content/t47w20670k411166/xxlarge1072.gif) ![tscy](/content/t47w20670k411166/xxlarge1094.gif) ![icy](/content/t47w20670k411166/xxlarge1080.gif) ![ocy](/content/t47w20670k411166/xxlarge1086.gif) ![ncy](/content/t47w20670k411166/xxlarge1085.gif) ![ncy](/content/t47w20670k411166/xxlarge1085.gif) ![ycy](/content/t47w20670k411166/xxlarge1099.gif) ![pcy](/content/t47w20670k411166/xxlarge1087.gif) ![ocy](/content/t47w20670k411166/xxlarge1086.gif) ![tcy](/content/t47w20670k411166/xxlarge1090.gif) ![iecy](/content/t47w20670k411166/xxlarge1077.gif) ![tscy](/content/t47w20670k411166/xxlarge1094.gif) ![icy](/content/t47w20670k411166/xxlarge1080.gif) ![acy](/content/t47w20670k411166/xxlarge1072.gif) ![lcy](/content/t47w20670k411166/xxlarge1083.gif) ![ocy](/content/t47w20670k411166/xxlarge1086.gif) ![acy](/content/t47w20670k411166/xxlarge1072.gif) ![tcy](/content/t47w20670k411166/xxlarge1090.gif) ![ocy](/content/t47w20670k411166/xxlarge1086.gif) ![mcy](/content/t47w20670k411166/xxlarge1084.gif) ![mcy](/content/t47w20670k411166/xxlarge1084.gif) ![iecy](/content/t47w20670k411166/xxlarge1077.gif) ![tcy](/content/t47w20670k411166/xxlarge1090.gif) ![acy](/content/t47w20670k411166/xxlarge1072.gif) ![lcy](/content/t47w20670k411166/xxlarge1083.gif) ![lcy](/content/t47w20670k411166/xxlarge1083.gif) , ![vcy](/content/t47w20670k411166/xxlarge1074.gif) ![ycy](/content/t47w20670k411166/xxlarge1099.gif) ![rcy](/content/t47w20670k411166/xxlarge1088.gif) ![acy](/content/t47w20670k411166/xxlarge1072.gif) ![zhcy](/content/t47w20670k411166/xxlarge1078.gif) ![iecy](/content/t47w20670k411166/xxlarge1077.gif) ![ncy](/content/t47w20670k411166/xxlarge1085.gif) ![ncy](/content/t47w20670k411166/xxlarge1085.gif) ![ycy](/content/t47w20670k411166/xxlarge1099.gif) ![kcy](/content/t47w20670k411166/xxlarge1082.gif) ![dcy](/content/t47w20670k411166/xxlarge1076.gif) ·![mcy](/content/t47w20670k411166/xxlarge1084.gif) ![ocy](/content/t47w20670k411166/xxlarge1086.gif) –1.
Excerpt from a Dissertation by I. A. Kahwa, in fulfilment of the requirements for the degree of M. Sc. at the University of Dar es Salaam. The authors wish to thank the University Research and Publications Committee for grants which enabled carrying out of the preliminary studies, and the Staff Development Committee of the University of Dar es Salaam for financial support to I. A. Kahwa. |
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