MAGNETIC BIREFRINGENCE OF A SERIES OF NEMATOGENIC COMPOUNDS

Cotton-Mouton constants C-m of nematogenic oligomers of the oxybenzoat e series have been determined in solution. The experimental values of C-m were compared with the Cotton-Mouton constant calculated from grou p additivity schemes: For the tenser of the diamagnetic susceptibility , the scheme of Flygare (Chem. Rev. 1974, 74, 653) was used, and for t he polarizability tenser group, contributions deduced previously from depolarized Rayleigh scattering (DRS; J. Phys. Chem. 1990, 94, 3215) w ere employed. Good agreement of measured and calculated C-m values is found. The influence of the local field correction used for the evalua tion of both the DRS and the Cotton-Mouton constant is discussed.