Donor properties of triphenylantimony dihalides : preparation and crystal structures of Ph3SbCl2SbCl3and [Ph3SbCl][SbCl6]
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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.
J. Chem. Soc., Dalton Trans.
author list (cited authors)
Hall, M., & Sowerby, D. B.
complete list of authors
Hall, Michael||Sowerby, D Bryan