Si-O-Bindungsspaltung in einem Siloxamin durch Aluminiumhydrid

Veith, Michael; Spaniol, Patrick

doi:10.1002/(sici)1521-3749(1998110)624:11<1891::aid-zaac1891>3.0.co;2-g

Cited by 4 publications

(2 citation statements)

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“…The cyclic compound III, which can be sublimed without decomposition, is of more general interest as there are only, to the best of our knowledge, two examples of tetra-coordinated aluminium bound by H, N, O [25,26]. Most of the amino-oxo-alanes isolated so far have aluminium atoms of coordination numbers 5 and 6 [27][28][29][30][31][32][33][34].…”

Section: IIImentioning

confidence: 99%

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Template-assisted ordering of Pb nanoparticles prepared from molecular-level colloidal processing

Veith

Mathur

König

et al. 2004

Comptes Rendus. Chimie

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Lead nanoparticles ranging from 10-200 nm were prepared by reacting [Pb{N(SiMe 3 ) 2 } 2 ] with the reducing agent tert-butoxy alane, [H 2 Al(OtBu)] 2 , in non-aqueous media. By this reaction, Pb nuclei on the molecular scale can be produced imparting a high regularity of shape and size to the resulting nanoparticles. The amino-alkoxo-alane {[(Me 3 Si) 2 N][tBuO]Al-H} 2 is formed as the main molecular by-product. The molecular structure of this amino-alkoxo-alane was determined by single crystal X-ray diffraction techniques revealing a centro-symmetric molecule with a central Al 2 O 2 ring (Al-O = 1.848(1) Å) to which tert-butyl (on oxygen) and hexamethyldisilazyl and hydrogen atoms (on aluminium) are bonded. Coloured sols of lead particles were obtained using donor solvents containing N, S and O atoms. The optical absorption spectra of colloids obtained at different concentrations of the starting materials indicate that the colour change (yellow -orange -burgundy red) is related to the particle size and/or the aggregation of particles in more concentrated solutions. The particles are nanoscopic and can be redispersed after a short ultrasonic treatment. This phase-separation is related to the nature of Pb-ligand interactions and to the aggregation of particles in the colloidal solution. Particle growth and inter-particle aggregation were observed by electron microscopy studies and absorption spectra of lead particles present in different solutions. A variation of concentration of lead clusters present in the colloids shows a shift in the absorption spectra related to plasmon-plasmon interaction typically observed in the aggregates of metal nanoparticles. Porous anodic alumina membranes were filled with lead nanoparticles either by vacuum-induced infiltration of lead particles or by reduction of the Pb(II) precursor within the pores. The latter approach proved to be more successful in obtaining Pb/Al 2 O 3 composites. The chemical composition and morphology of Pb particles in colloidal solutions and those present in and on the porous alumina membrane were investigated by XRD, FT-IR, SEM and TEM analysis.

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Section: IIImentioning

confidence: 99%

“…The centro-symmetric molecule has an Al 2 O 2 ring of almost equal Al-O bond lengths (1.847(1) Å) with tert-butyl groups bonded to the oxygen atoms and hexamethyldisilazyl and hydrogen bonded to the aluminium atoms. The bond lengths and angles are in the expected range [25][26][27][28][29][30][31][32][33][34].…”

Section: IIImentioning

confidence: 99%