SOLVENT EFFECT ON THE COLOR OF COBR2 SOLUTIONS

The chromaticity colorimetry has been applied to the study of CoBr2 so lutions color in organic solvents, The values of chromaticity coordina tes have been determinated from absorption spectra. It was stated that the ability to form cobalt(II) complex ions of particular symmetry is consequence of donor-acceptor properties of the solvents. The tendenc y to form the tetrahedral ions has been observed in the solvents descr ibed by low acceptor number (AN < 30). In the solvents with AN > 30 th e participation of the tetrahedral form in the mixture with the octahe dral one increases with the increase of the complementary wavelength.