Abstract
Thermal decomposition of mono pyridine N-oxide complexe; of cobalt(II), nickel(II) and copper(II) propionates and mono quinoline N-oxide complex of copper(II) ben zoate has been studied by TG and DTA techniques. These dimeric complexes are stable upto 350–380 K and decompose in two stages: (i) successive elimination of the two ligand molecules (mostly endothermic); and (ii) decomposition of the resulting anhydrous metal(II) carboxylates by an exothermic multistep process in air.
Résumé
On a étudié, par TG et ATD, la décomposition thermique des propionates des complexes mono-pyridine N-oxyde de cobalt(II), de nickel(II) et de cuivre(II) ainsi que du benzoate mono-quinoline N-oxyde de cuivre(II). Ces complexes dimères sont stables jusqu'à 350–380 K et se décomposent en deux étapes: (i) élimination successive des deux moléculesligands (la plupart du temps endothermique); et (ii) décomposition des carboxylates anhydres des métaux(II) formés par un processus en plusieurs étapes dans de l'air.
Zusammenfassung
Die thermische Zersetzung der Monopyridin N-oxidkomplexe der Kobalt(II)-, Nickel(II) und Kupfer(II)-propionate sowie des Monochinolin N-oxidkomplexes von Kupfer(II)-benzoat wurden durch TG und DTA-Methoden untersucht. Diese dimeren Komplexe sind bis zu 350–380 K stabil und werden in zwei Stufen zersetzt: (i) sukzessive Eliminierung der zwei Ligandmoleküle (hauptsÄchlich endotherm); und (ii) Zersetzung der entstehenden wasserfreien Metall(II)carboxylate durch einen mehrstufigen exothermen Vorgang in Luft.
РЕжУМЕ
МЕтОДАМИ тг И ДтА БылО ИжУЧЕНО тЕРМИЧЕскОЕ РАжлОжЕНИЕ МОНО пИРИ ДИН-N-ОксИДНых кОМплЕксОВ пРОпИОНА тОВ кОБАльтА (II), НИкЕль (II) И МЕДИ (II), А тАкжЕ МОНО хИНОлИН-N-ОксИДНОгО кО МплЕксА БЕНжОАтА МЕД И (II). ЁтИ ДИМЕРНыЕ кОМплЕксы с тАБИльНы ДО тЕМпЕРАтУР 350–380 к И В Д АльНЕИшЕМ РАжлАгАУт сь В ДВЕ стАДИИ: (1) пОслЕДОВАтЕл ьНОЕ ВыДЕлЕНИЕ ДВУх МОлЕк Ул лИгАНДА И ЁтОт пРОц Есс БОльшЕИ ЧАстьУ ЁНДОтЕРМИЧЕс кИИ И (2) РАжлОжЕНИЕ ОБРАжУУЩ Ихсь БЕжВОДНых кАРБО ксИлАтОВ МЕтАллОВ пО ЁкжОтЕРМ ИЧЕскОМУ МНОгОстАДИ ИНОМУ пРОцЕссУ В АтМОсФЕРЕ ВОжДУхА.
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The authors are thankful to Dr. R. K. Dewan, Head of the Chemistry Department, University of Jammu, Jammu for providing necessary facilities in the department. The authors are also indebted to Dr. O. P. Vig, Head of the Chemistry Department, Panjab University, Chandigarh for assistance provided. One of the authors (R. K.) is grateful to University Grants Commission, New Delhi for the award of Junior Research Fellowship.
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Kumar, N., Kachroo, P.L. & Kant, R. Thermal decomposition of some N-oxide complexes of cobalt(II), nickel(II) and copper(II) carboxylates. Journal of Thermal Analysis 17, 81–85 (1979). https://doi.org/10.1007/BF02156600
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DOI: https://doi.org/10.1007/BF02156600