Electro-optical studies on synthetic polyelectrolytes. I. Ultraviolet electric dichroism of poly-N-alkylvinylpyridinium bromides in aqueous solution.
The electric dichroism of aqueous solutions of poly-2- and 4-vinylpyridinium bromides has been measured in the 220 to 300 nm region. From the knowledge of the assignments of the absorption bands, the orientation of the pyridinium ring with respect to the macromolecular axis was determined for the poly-N-butyl-4-vinylpyridium bromide. An estimation of the birefringence contribution in the visible region originating from these ultraviolet dichroic bands revealed that the negative birefringence observed mainly arose from electronic transitions at shorter wavelengths.
D008433:Mathematics; D008968:Molecular Conformation; D011145:Polyvinyls; D011725:Pyridines; D013056:Spectrophotometry, Ultraviolet
D011145:Polyvinyls; D011725:Pyridines