Abstract
A zeroth order theory of circular dichroism has been reviewed, which was previously developed for a linear alternating array or a two-fold helix of chromophores, and it has been further extended to the first order approximation for a system, in which each chromophore has only two excited states with mutually parallel polarizations. These theories are applied to circular dichroism associated with the visible and the near ultraviolet transitions of the acridine orange–β-form poly(S-carboxymethyl-L-cysteine) complex. Results predicted by the zeroth order theory are confirmed in this system. Essentially two exciton levels of each excited state are optically active, and they have rotatory strengths of equal magnitude but of opposite signs. Circular dichroism calculated to the first order is compared with the observed one, and it is shown that, on the average, up to eight acridine orange molecules can stack together to form a linear alternating array. Assumptions inherent in the theory and in its application to the present system are discussed.
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Ikeda, S., Imae, T. Calculated Circular Dichroism of Acridine Orange Bound to β-Form Poly(S-carboxyinethyl-L-cysteine). Polym J 4, 301–308 (1973). https://doi.org/10.1295/polymj.4.301
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DOI: https://doi.org/10.1295/polymj.4.301