FOURIER-TRANSFORM INFRARED AND RAMAN-SPECTRA OF METAL HALIDE-COMPLEXES OF 3,5-LUTIDINE IN RELATION TO THEIR STRUCTURES

Fourier transform infrared (4000-200 cm(-1)) and Raman (3500-50 cm(-1) ) spectra are reported for metal(II) halide 3,5-lutidine (3,5-dimethyl pyridine) complexes of the following stoichiometries: M(3,5L)(4)X(2) M =Co or Ni, X=Cl or Br; M=Mn or Cu, X=Br; M=Cd, X=I; M(3,5L)(3)X(2) M=F e, X=Cl; M=Cu, X=Br; Hg(3,5L)X(2) X=Cl or Br. Vibrational assignments are given for all the observed bands. Some structure-spectra correlati ons are found. For a given series of isomorphous complexes the sum of the difference between the liquid and ligand values of the vibrational modes of 3,5-lutidine is found to increase in the order of the second ionization potentials of the metals. The frequency shifts are also fo und to depend on the halogen.