Darstellung und Eigenschaften von Europium(II)-amid

Jůza, Robert; Hadenfeldt, C.

doi:10.1007/bf00606217

Cited by 48 publications

(16 citation statements)

References 2 publications

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“…It is known that europium and ytterbium among rare earth elements readily dissolve in liquid ammonia to yield homogeneous solutions with a deep blue color, being characteristic of the ammonia-solvated electrons [1]. The rare earth metal/NH 3 systems are known to change through varied steps [2][3][4]. The thermal decomposition products of the Eu/NH 3 and Yb/NH 3 finally yield nitride (EuN and YbN) through diamide, triamide or imide, respectively.…”

Section: Introductionmentioning

confidence: 98%

Preparation and catalytic properties of rare earth amides obtained by reactions of Eu or Yb metals with liquid ammonia

Imamura

Sakata

Tsuruwaka

et al. 2006

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 98%

Preparation and catalytic properties of rare earth amides obtained by reactions of Eu or Yb metals with liquid ammonia

Imamura

Sakata

Tsuruwaka

et al. 2006

Journal of Alloys and Compounds

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“…Ammonia, which can be classified as a kind of inorganic amine, offers reaction conditions down to Ϫ78°C. The dissolution of metals like the alkaline [41], alkaline earth or the rare earth metals europium [42] and ytterbium [43] in liquid ammonia leads to deep blue solutions containing solvated electrons [44,45]. Although these solutions are highly reactive and proved their value in different fields of alkaline metal chemistry already, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…As this report shows the variety of products from the oxidation of rare earth metals in liquid ammonia is even more diversified. As the formation of amides [Ln(NH 2 ) x ] and nitrides LnN in liquid ammonia demonstrates [42,43,52,53], autoprotolysis of ammonia and participation of NH 3 molecules, NH 2 Ϫ and N 3Ϫ anions in the coordination of the metal centres in addition to N-heterocyclic amines further increase the variability of the amide products obtained.…”

Section: Introductionmentioning

confidence: 99%

The Utilization of Solid State Chemistry Reaction Routes as New Syntheses Strategies for the Coordination Chemistry of Rare Earth Amides

Müller‐Buschbaum

2005

Zeitschrift anorg allge chemie

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Solvent free high-temperature reactions in melts are well known procedures in Solid-State Chemistry. Although the reaction conditions are extreme considering the properties of organic ligands they can also be utilized for Coordination Chemistry and offer a fruitful alternative to usual solvent treatments. This includes the chemistry of organic amides of the rare earth elements. The avoidance of any solvent renders novel homoleptic complexes accessible but also implies difficulties bound to the solid state of the reaction mixtures. The high chemical affinity of the rare earth elements towards halides and especially oxygen limits known homoleptic amides obtained via solvent treatments mostly to multi-chelating ligands like porphyrines, calix-pyrroles etc. With no special conditions met like a high steric demand, solvent molecules as cocoordinating partners enforce the formation of heteroleptic species. This influence can be avoided by the use of completely solvent free reactions, such as melt reactions in which a solid is reacted directly with a melt or with a substance under solvothermal conditions. The high reactivity of the rare earth metals allows the direct oxidation with amines and thus to use high-temperature reactions for the formation of rare earth amides. This includes homoleptic com- Die Anwendung Festkörper-chemischer Synthesemethoden als neue Synthesestrategie für die Koordinationschemie von Selten-Erd-AmidenInhaltsübersicht. Solvensfreie Reaktionen bei hohen Temperaturen sind gut bekannte Vorgehensweisen in der Festkörperchemie. Obgleich die Reaktionsbedingungen extrem bezüglich der Eigenschaften organischer Liganden sind, können sie für die Koordinationschemie genutzt werden und bieten eine Erfolg versprechende Alternative zu gewöhnlichen Reaktionen in Lösungsmitteln. Dies schließt die Chemie organischer Selten-Erd-Amide ein. Die Vermeidung jedweder Lösemittel macht neuartige, homoleptische Komplexe zugänglich, sie bringt aber auch Schwierigkeiten mit sich, die mit dem festen Zustand des gesamten Reaktionsgemenges verbunden sind. Die hohe chemische Affinität der Selten-Erd-Elemente zu den Halogenen und allen voran zu Sauerstoff beschränkt die Bildung homoleptischer Amide zumeist auf die Verwendung multichelatisierender Liganden, wie z.B. mit Porphyrinen oder Calix-Pyrrolen. So keine besonderen Bedingungen wie ein hoher sterischer Anspruch eingehalten werden, erzwingen Solvens-Moleküle als co-koordinierende Teilchen die Bildung von heteroleptischen Verbindungen. Dieser Einfluss kann vermieden werden, wenn stattdessen vollständig solvensfreie Synthesen durchgeführt werden. Gerade die Schmelzsynthese bietet solche Möglichkeiten, da ein Feststoff direkt mit einer Schmelze reagiert oder mit einer Substanz unter solvothermalen Bedingungen. Die hohe Reaktivität der Metalle erlaubt deren direkte Oxidation mit Aminen und damit, derar-811pounds from simple ligands. Crystallization under reaction conditions is possible; no re-crystallization step is necessary preventing the risk of a change of the chemical char...

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“…1), the triamide Yb(NH 2 ) 3 decomposed to the cubic YbN upon heating around 773 K similarly to Yb(NH 2 ) 2 [4]. The amides were usually converted into the nitride via imide (YbNH) [6][7][8]; thus, thermal decomposition to the nitride occurred successively. According to TPD of Yb(NH 2 ) 3 (Fig.…”

Section: Preparation Of Nanocrystalline Ybn and Eun By Thermal Decompmentioning

confidence: 98%

Preparation and properties of nanocrystalline ytterbium and europium nitride (YbN and EuN)

Imamura

Sakata

Nuruyu

et al. 2006

Journal of Alloys and Compounds

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Darstellung und Eigenschaften von Europium(II)-amid

Cited by 48 publications

References 2 publications

Preparation and catalytic properties of rare earth amides obtained by reactions of Eu or Yb metals with liquid ammonia

Preparation and catalytic properties of rare earth amides obtained by reactions of Eu or Yb metals with liquid ammonia

The Utilization of Solid State Chemistry Reaction Routes as New Syntheses Strategies for the Coordination Chemistry of Rare Earth Amides

Preparation and properties of nanocrystalline ytterbium and europium nitride (YbN and EuN)

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