Fourier transform infrared spectra (4000-400 cm(-1)) are reported for metal(II) halide 4-vinlypridine complexes of the following stoichiometries: [MX2(4-vipy](n) (n = 4, M = Ni, X = Cl or Br; n = 2, M = Cd, X = Cl, Br or I) and assignment are given for all the observed bands. These spectra were compared with X-ray powder diffraction patterns of complexes. It is shown that the proposed structures for these complexes derived from FTIR spectra are consistent with the X-ray powder diffraction measurements and the elemental analysis results. Coordination effect on 4-vinylpyridine has also been investigated. (C) 2001 Elsevier Science B.V. All rights reserved.