DONOR PROPERTIES OF TRIPHENYLANTIMONY DIHALIDES - PREPARATION AND CRYSTAL-STRUCTURES OF PH3SBCL2.SBCL3 AND [PH3SBCL][SBCL6]
Academic Article
Overview
Identity
Additional Document Info
Other
View All
Overview
abstract
Triphenylantimony dichloride reacts with both antimony(III) and antimony(V) chloride to give addition compounds with the stoicheiometry Ph3SbCl2SbCl3 and Ph3SbCl2SbCl5, respectively. X-Ray analysis of the former shows the presence of only weak interactions between the axial chlorine atoms of Ph3SbCl2 and adjacent SbCl3 molecules to give polymeric chains parallel to the a axis. The trigonal bipyramidal geometry of Ph3SbCl2 is little changed; co-ordination about SbIII is square pyramidal with three short (mean 2.337 ) and two long (mean 3.262 ) distances. In the SbCl5 compound there is a chloride ion transfer to SbCl5 giving a structure best described in terms of the ionic formulation [Ph3SbCl]+[SbCl6]-. Residual anion-cation interaction is shown by a Cl Sb contact of 3.231 , and the cation geometry is intermediate between the trigonal pyramidal and tetrahedral extremes. Reactions between Ph3SbX2 (X = F, Br, or I) and SbCl3, SbBr3, or SbCl5 are also described.