Copper(I) binds to 2,7-diimino-1,8-naphthyridine in solution to form a mixture of equilibrating mono- and polynuclear complexes, as identified by electrospray MS and monitored by UV-visible spectrophotometric titrations, including a binuclear metallo-helicate for which X-ray data are available but whose formation does not require cooperative associations.
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Ziessel et al. (2000) studied this question.
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