110296-11-2Relevant articles and documents
?-Complexes of p-Block Elements: Synthesis and Structures of Adducts of Arsenic and Antimony Halides with Alkylated Benzenes
Schmidbaur, Hubert,Nowak, Reinhold,Steigelmann, Oliver,Mueller, Gerhard
, p. 1221 - 1226 (2007/10/02)
1,2,4,5-Tetramethyl- and pentamethylbenzene form stable 1:2 complexes with SbCl3 of the type (C6H6-nMen)*2SbCl3 (1,2) with an inverse sandwich structure.The compounds crystallize isotypically and are isostructural to the (hexamethylbenzene)antimony and -bismuth complexes.They are thus built of tetrameric chlorine-bridged Sb4Cl12 units, which are crosslinked at the metal centers with four other tetramers by double-sided arene coordination (X-ray structure analysis of 1).The Sb atoms, which are in a distorted trigonal bipyramidal environment, show a slight deviation from a centric (η6) coordination.The same stoichiometry and the same structural principle are found for the complex (C6Me6)*2AsCl3 (4), which is obtained from solutions of hexamethylbenzene and AsCl3 in toluene.In 4 the arsenic atoms are η6-coordinated to the hexamethylbenzene ring from both sides (X-ray analysis).Treatment of AsBr3 with hexamethylbenzene leads to a product of the composition 5(C6Me6)*AsBr3.Reaction of hexaethylbenzene with AsCl3 in petroleum ether leads to the formation of the 1:2 complex (C6Et6)*2AsCl3 (5), built of discrete inverse sandwich units, which are arranged in strings parallel to the crystallographic c axis.From solutions of AsCl3 (AsBr3), SbCl3 (SbBr3) and hexaethylbenzene in petroleum ether ternary compounds are isolated with an As:Sb ratio of 1:5.2 and 1:1.86, respectively.Single crystal X-ray structure determinations failed as a consequence of severe disorder.
