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Inorganic double helices having 2 and 2.5 turns are formed by the tetra- and penta(bipyridine) ligands 1 and 2, respectively, upon addition of Cu1 salts. These polynuclear complexes, in which the copper ions are aligned like a string of pearls, are estimated to be about 22 and 27 nm long, respectively.
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Lehn et al. (1988) studied this question.
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