Abstract
WE here report a linear dichroism (LD) exhibited by isotropic chromophores in a condensed anisotropic medium and caused by anisotropic effective local fields. We shall call the effect Wiener dichroism (WLD) when the anisotropic reaction field arises from the presence of two (or more) different dielectric domains (phases in our notation) which are internally isotropic but which are separated by surfaces with non-spherical geometry. With a coloured cubic anion, like Co(NO2)3−6, in the aqueous phase of a 20% solution of cetyltrimethylammoniumbromide (CTAB), known to contain rod-shaped micelles, a positive WLD is observed, while a cation, like Co(NH3)3+6 yields negative WLD, when the micelles are oriented. This difference between cations and anions arises from the different average locations of the ions with respect to the cylindrical counter-ion layer surrounding the micelle. This is the first time a dichroism has been observed caused exclusively by local fields.
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NORDÉN, B., DAVIDSSON, Å. & JOHANSSON, L. Linear dichroism of cations and anions in micellar solutions. Nature 261, 400–402 (1976). https://doi.org/10.1038/261400a0
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DOI: https://doi.org/10.1038/261400a0
