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Soc., Dalton Trans."},{"key":"ref18\/cit18","unstructured":"As shown in Figure S8 (Supporting Information), the optimized geometry of1\u2212Cu2+1:1 complex is similar to that of1\u2212Hg2+1:1 complex, indicating that these cations (Cu2+, Pb2+) coordinates with cyclen and carbonyl oxygen, as is also the case for1\u2212Hg2+1:1 complex (Figure5a)."},{"key":"ref19\/cit19a","doi-asserted-by":"crossref","first-page":"5039","DOI":"10.1021\/ol7022714","volume":"9","author":"Zhang X.","year":"2007","journal-title":"Org. Lett."},{"key":"ref19\/cit19b","doi-asserted-by":"crossref","first-page":"10107","DOI":"10.1021\/ja051075b","volume":"127","author":"Kwon J. Y.","year":"2005","journal-title":"J. Am. Chem. 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