Complexes of tin(IV) halides with 1,2-ethylenebisdiphenylarsine and 1,4-butylenebisdiphenylarsine

Abstract The ligands 1,2-ethylenebisdiphenylarsine (EDA) and 1,4-butylenebisdiphenylarsine (BDA) form complexes with tin(IV) chloride and bromide of the types SnX 4 L (X  Cl, Br; L  EDA, BDA) and (SnX 4 ) 2 L 3 (X  Br, L  BDA). The 1:1 complexes are assigned a cis -octahedral geometry on the basis of their molar conductance, IR spectra and Mossbauer parameters. The complex (SnBr 4 ) 2 (BDA) 3 may have a pentagonal bipyramidal disposition of donor atoms about each tin atom in the solid state but in nitrobenzene solution there is some dissociation into ions.