N° 4. — Oxydation du zinc aux hautes températures. Cinétique de l’oxydation du zinc dans une atmosphère d’oxygène et de bioxyde de carbone

Murgulescu, I. G.; Cismaru, D.

doi:10.1051/jcp/1961580181

Cited by 3 publications

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“…Finally, the kinetics of nitriding of magnesium by pure.nitrogen (curve A) show that sublimation of metal occurs simultaneously with the surface reaction. These kinetics are very different from those observed in previous investigations (9). These latter results are always more or less similar to the kinetics observed here for reaction of magnesium with commercial nitrogen.…”

Section: Effect Of Nitrogen Purity On the Nitriding Of Metalscontrasting

confidence: 55%

Effect of Nitrogen Purity on the Nitriding of Metals Using Purity Controlled Nitrogen

Aubry¹,

Streiff

1971

J. Electrochem. Soc.

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Section: Effect Of Nitrogen Purity On the Nitriding Of Metalscontrasting

confidence: 55%

Effect of Nitrogen Purity on the Nitriding of Metals Using Purity Controlled Nitrogen

Aubry¹,

Streiff

1971

J. Electrochem. Soc.

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“…In this case there was considerable interest in the origin of the central oxide anion, which was established to arise from CO 2 by reductive deoxygenation, with the reduced product being diethylformamide. This is chemically reasonable in light of the reducing power of metallic zinc and the precedent for deoxygenation of CO 2 by zinc at high temperature . In the case of our preparations of 1 − 3 , this is an unlikely scenario, and a hydrolytic process involving trace amounts of adventitious water is the most likely source of the oxide dianion.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Structure, and Preparative Transamination of Tetrazinc Carbamato Complexes Having the Basic Zinc Carboxylate Structure

2002

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The series of tetranuclear zinc(II) carbamato complexes (Zn(4)O)(O(2)CR)(6), (1, R = diethylamino; 2, R = piperidino; 3, R = pyrrolidino) was prepared. Complexes 2 and 3 were crystallographically characterized and shown to have the same tetrahedral Zn(4)O(6+) core. Complex 2 crystallizes in the cubic space group I(-)43d, a = 24.0131(5) A, V = 13846.6(5) A(3), R(1976 observed reflections) = 0.0194, and GOF = 1.013. Complex 3 crystallizes in the triclinic space group P(-)1, a = 10.3178(6) A, b = 10.6962(6) A, c = 19.5130(11) A, alpha = 81.9070(10), beta = 75.4880(10), gamma = 81.6540(10), V = 2050.4(2) A(3), R(6141 observed reflections) = 0.0334, and GOF = 0.979. NMR spectroscopy was used to show that the (Zn(4)O)L(6) structure was maintained in nonpolar solvents. The complexes reacted with free amine in nonpolar solvents, which resulted in facile conversion of one member of the series to another. For example, reacting 1 with a stoichiometric amount of pyrrolidine in tetrahydrofuran followed by workup resulted in the quantitative formation of 3 with liberation of diethylamine. Formally, this is a transamination metathesis reaction between the diethylcarbamate ligand and pyrrolidine. The reaction is complete within 3 min at room temperature, in marked contrast to the extreme conditions required to effect transamination on organic carbamates. The complexes also undergo a facile transcarboxylation reaction with carbon dioxide which results in scrambling of the carboxyl group of the carbamate ligand with free CO(2), also complete in about 3 min. Both transamination and transcarboxylation reactions are consistent with the intermediacy of free CO(2). However, because of the propensity for the complexes to hydrolyze to liberate CO(2), the role of adventitious moisture in facilitating the reaction cannot presently be rejected.

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Heubner¹,

Melin²,

Jehn³

1976

Reine Und Angewandte Metallkunde in Einzeldarstellungen

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N° 4. — Oxydation du zinc aux hautes températures. Cinétique de l’oxydation du zinc dans une atmosphère d’oxygène et de bioxyde de carbone

Cited by 3 publications

References 0 publications

Effect of Nitrogen Purity on the Nitriding of Metals Using Purity Controlled Nitrogen

Effect of Nitrogen Purity on the Nitriding of Metals Using Purity Controlled Nitrogen

Synthesis, Structure, and Preparative Transamination of Tetrazinc Carbamato Complexes Having the Basic Zinc Carboxylate Structure

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