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The UV and CD spectra of ( R )-(+)-2,2‘-diiodo-1,1‘-binaphthalene show an unexpectedly large value of the wavelength splitting between the two main bands, resulting from the exciton coupling of 1 B b transitions. An hypothesis is proposed on transition moments directions, making it possible to relate quantitatively the observed splitting to the orthogonal arrangement found in the solid state and calculated for the structure in solution.
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Bari et al. (2000) studied this question.
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