A remarkably stable base-stacked structure is shown by the 70-membered ring 2, which possesses only four nucleotide bases and is formed by efficient cyclization of the oligonucleotide conjugate 1. In the presence of alkali, 2 twists to bring the stilbene groups into close proximity, as indicated by an excimer emission upon irradiation.
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Herrlein et al. (1997) studied this question.
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