On the Lewis acidity of tris(pentafluorophenyl)antimony(V) dichloride towards neutral monodentate O, N and S donor ligands

Hexa-coordinate neutral adducts (C6F5)3SbCl2·L(I) [L=DMSO, DBSO, Ph3AsO, Ph3PO, DPF, DMF, Py, 3-Pic, TU] and penta-coordinate cationic complexes [(C6F5)3Sb(Ph3AsO)2][ClO4]2 (II) and [(C6F5)3Sb(bipy)][ClO4]2 (III) have been synthesised. Molecular adducts are monomeric in benzene and non-electrolyte in acetonitrile. IR spectra and conductance measurement suggest the absence of coordination of ClO4 group to Sb atom in cationic complexes. oscopic data conform to the requirement of octahedral configuration for neural complexes (I) and a trigonal bipyramidal structure for complex cations (II) and (III).