Synthesis and characterization of polynuclear lanthanide aryloxides

Carretas, José M.; Branco, Joaquim B.; Marçalo, Joaquim; Isolani, Paulo Celso; Domingos, Ângela; Matos, António Pires de

doi:10.1016/s0925-8388(01)01122-7

Cited by 13 publications

(16 citation statements)

References 8 publications

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Section: Resultsmentioning

confidence: 99%

“…These compounds were formulated by elemental analysis as Eu(OC 6 H 4 OMe) 2 and Yb(OC 6 H 4 OMe) 3 . The reaction of samarium metal with 2-methoxyphenol by metal vapour synthesis gave a grey solid, soluble in THF and dichlorometane and formulated as Sm(OC 6 H 4 OMe) 3 . These results were in agreement with analogue reactions involving phenols containing supplementary donor functions, namely 2-aminophenol, 2,6-dimethoxyphenol and 2-amino-p-cresol, for which similar formulations were obtained [12].…”

Section: Resultsmentioning

confidence: 99%

“…All absorbers were encapsulated in a special air tight sample holder. 3 Samarium atoms (1.69 g, 11.24 mmol) were vaporised with a resistance heating furnace (480 W) and were co-condensed with 40 ml of 2-methoxyphenol (36.38 mmol) onto a liquid nitrogen-cooled surface over a period of 3 h. The resultant mixture was allowed to warm slowly to room temperature under a nitrogen atmosphere. The product was washed out with THF and filtered through a Celite bed.…”

Section: Methodsmentioning

confidence: 99%

“…A greenish yellow solid formulated as Yb(OC 6 H 4 OMe) 3 3.91. IR (cm −1 ): 2580w, 2300w, 1580m, 1480s, 1450s, 1370m, 1320w, 1280w, 1250m, 1210w, 1160w, 1110s, 1035m, 1010s, 900w, 845s, 755s, 730s, 595w, 580w, 530w, 460w, 400w.…”

Section: Yb(ocmentioning

confidence: 99%

“…Over the last years we have studied the reactions of lanthanide metals with several phenols using the metal vapour synthesis (MVS) technique [1,2], and the metal dissolution in liquid ammonia [2,3]. The type of ligands used was diverse ranging from the less to the more bulky phenols, including simple and polycyclic phenols.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of samarium, europium and ytterbium aryloxides

Carretas

Branco

Marçalo

et al. 2004

Journal of Alloys and Compounds

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Yb(ocmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and characterization of samarium, europium and ytterbium aryloxides

Carretas

Branco

Marçalo

et al. 2004

Journal of Alloys and Compounds

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Nanomorphology Effects in Semiconductors with Native Ferromagnetism: Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition

et al. 2017

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Semiconductors with native ferromagnetism barely exist and defined nanostructures are almost unknown. This lack impedes the exploration of a new class of materials characterized by a direct combination of effects on the electronic system caused by quantum confinement effects with magnetism. A good example is EuO for which currently no reliable routes for nanoparticle synthesis can be established. Bottom‐up approaches applicable to other oxides fail because of the labile oxidation state +II. Instead of targeting a direct synthesis, the two steps—“structure control” and “chemical transformation”—are separated. The generation of a transitional, hybrid nanophase is followed by its conversion into EuO under full conservation of all morphological features. Hierarchical EuO materials are now accessible in the shape of oriented nanodisks stacked to tubular particles. Magnetically, the coupling of either vortex or onion states has been found. An unexpected temperature dependence is governed by thermally activated transitions between these states.

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Enhancing the Value of Free Metals in the Synthesis of Lanthanoid Formamidinates: Is a Co‐oxidant Needed?

Deacon

Junk

Werner

2015

Chemistry A European J

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Treatment of N,N'-bis(aryl)formamidines (ArFormH), N,N'-bis(2,6-difluorophenyl)formamidine (DFFormH) or N,N'-bis(2,6-diisopropylphenyl)formamidine (DippFormH), with europium metal in CH3 CN is an efficient synthesis of the divalent complexes: [{Eu(DFForm)2 (CH3 CN)2 }2 ] (Eu1) or [Eu(DippForm)2 (CH3 CN)4 ] (Eu2). The synthetic method was extended to ytterbium, but the metal required activation by addition of Hg(0) . With DFFormH in CH3 CN, [{Yb(DFForm)2 (CH3 CN)}2 ] (Yb1) was obtained in good yield, and [Yb(DFForm)2 (thf)3 ] (Yb3) was obtained from a synthesis in CH3 CN/THF. Thus, this synthetic method completely circumvents the use of either salt metathesis, or redox transmetallation/protolysis (RTP) protocols to prepare divalent rare-earth formamidinates. Heating Yb1 in PhMe/C6 D6 resulted in decomposition to trivalent products, including one from a CH3 CN activation process. For a synthetic comparison, divalent ytterbium DFForm and DippForm complexes were synthesised by RTP reactions between Yb(0) , Hg(R)2 (R=Ph, C6 F5 ), and ArFormH in THF, leading to the isolation of either [Yb(DFForm)2 (thf)3 ] (Yb3), or the first five coordinate rare-earth formamidinate complex [Yb(DippForm)2 (thf)] (Yb4 b), and, from adjustment of the stoichiometry, trivalent [Yb(DFForm)3 (thf)] (Yb6). Oxidation of Yb3 with benzophenone (bp), or halogenating agents (TiCl4 (thf)2 , Ph3 CCl, C2 Cl6 ) gave [Yb(DFForm)3 (bp)] or [Yb(DFForm)2 Cl(thf)2 ], respectively. Furthermore, the structural chemistry of divalent ArForm complexes has been substantially broadened. Not only have the highest and lowest coordination numbers for divalent rare-earth ArForm complexes been achieved in Eu2 and Yb4 b, respectively, but also dimeric Eu1 and Yb1 have highly unusual ArForm bridging coordination modes, either perpendicular μ-1κ(N:N'):2κ(N:N') in Eu1, or the twisted μ-1κ(N:N'):2κ(N':F') DFForm coordination in Yb1, both unprecedented in divalent rare-earth ArForm chemistry and in the wider divalent rare-earth amidinate field.

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Synthesis and characterization of polynuclear lanthanide aryloxides

Cited by 13 publications

References 8 publications

Synthesis and characterization of samarium, europium and ytterbium aryloxides

Synthesis and characterization of samarium, europium and ytterbium aryloxides

Nanomorphology Effects in Semiconductors with Native Ferromagnetism: Hierarchical Europium (II) Oxide Tubes Prepared via a Topotactic Nanostructure Transition

Enhancing the Value of Free Metals in the Synthesis of Lanthanoid Formamidinates: Is a Co‐oxidant Needed?

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