7727-15-3Relevant articles and documents
Vibrational spectroscopy and normal coordinate analysis of μ halo hexahalodialuminates ions Al2X7- (X = Cl, Br, I) in some salts and in Friedel-Crafts solutions
Manteghetti, Alain,Potier, Antoine
, p. 141 - 148 (1982)
Infrared and Raman spectra are reported for (Me4N)Al2Cl7, (Et4N)Al2Cl7, KAl2Br7 and CsAl2I7 in the solid state at ordinary temperature.An assignment for practically all the vibrational modes is proposed for the three ions Al2Cl7-, Al2Br7- and Al2I7-.To elucidate the species occurring in the Friedel-Crafts liquids , the spectra of these solutions were also recorded.The quasi identity of the halogenide part of the spectra with the previous one leads to the unique formulation ArH2+Al2X7- for these solutions, in these cases the Al2X7- ion appears at a higher local symmetry of the AlX3 groups than in the solid state.An approximate valence force field calculation confirms the assignments.It also shows the transferability of force constants for a X-AlX3 model.Spectroscopic particularities are explained in terms of different coupling between bridged and terminal stretching modes.
Dimeric Di(tert-butyl)haloalanes and a Monomeric Di(tert-butyl)phosphino- di(tert-butyl)alane
Krossing, Ingo,N?th, Heinrich,Staude, Siegfried
, p. 1045 - 1051 (2008)
The di(tert-butyl)aluminum halides, tBu2AlX (X = Br, I) have been prepared in yields ranging from 55 to 64 % from AlX3 and Lit Bu in a 1: 2 molar ratio in pentane. In the crystal these pyrophoric compounds are dimeric featuring Al-X-Al bridges. The reaction of AlCI3 with LitBu in diethyl ether produced a volatile solvate of composition tBu3Al-Cl- AltBu2(OEt2). Reaction of this species with AlCl 3 at 120 °C yielded a separable mixture of tBu2AlCl and tBu2AlCl(OEt2). tBu2AlCl and tBu 2GaCl react with tBu2PLi to produce the monomeric compounds tBu2E-PtBu2 (E = Al, Ga). The aluminum compound decomposes at 111 °C to give a mixture of the cis/trans-isomers of [tBu(H) Al-PtBu2]2 while at 200 °C only the trans-isomer is formed.
Amorphous aluminum bromide fluoride (ABF)
Krahl, Thoralf,Kemnitz, Erhard
, p. 6653 - 6656 (2007/10/03)
Different octahedral units form the basis of the structures of the very strong Lewis acids aluminum bromide fluoride (ABF) and aluminum chloride fluoride (ACF) (see picture). A structure model for these phases is established in which the octahedra are linked through μ-bridging fluorine atoms and μ3-bridging X atoms (X = Cl, Br). The bridging of three octahedra by a heavy halogen atom explains the results of NMR and EXAFS analysis.