SYNTHESIS AND VIBRATIONAL-SPECTRA OF METAL HALIDE-COMPLEXES OF 3,5-LUTIDINE IN RELATION TO THEIR STRUCTURES

The synthesis and the results of an infrared and Raman spectroscopic s tudy are reported for metal(II) halide 3,5-lutidine (3,5-dimethylpyrid ine) complexes, M(3,5L)(2)X-2, M = Cd or Zn, X = Cl, Br or I; M = Co, Cu or Hg, X = Cl or Br; M = Mn, Fe or Ni, X = Cl, 3,5L = 3.5-lutidine. Vibrational assignments are given for all the observed bands. Some st ructure-spectra correlations were found. For a given series of isomorp hous complexes the sum of the difference of the values of the vibratio nal modes of 3,5-lutidine between the free ligand as liquid and the co mplexed ligand was found to increase in the order of the second ioniza tion potentials of the metals. The frequency shifts were also found to depend on the halogen.