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Strong exciton coupling occurs between adjacent pairs of naphthyl chromophores in the chiral sodium and europium complexes of L 1 ; in the constitutionally isomeric complexes of L 2 , intramolecular excimer formation is observed and both sets of Eu complexes give a well defined, metal-based circularly polarised emission.
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Dickins et al. (1997) studied this question.
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