Tin(IV) chloride derivatives of nickel(II) aldoximates have been obtained by reacting tin(IV) chloride with nickel(II) aldoximates in benzene. All the complexes are coloured solids and appear to be non-electrolytes in DMF. Elemental analyses agree with 1:1 stoichiometry. Magnetic, electronic and far i.r. spectral data suggest that the nickel(II) has changed its configuration from dsp 2 square-planar to sp 3 d 2 octahedral one as a result of reaction with the tin(IV) chloride. Tin(IV), also exhibits 6-coordination in these complexes.