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A synthetic route to a novel adenine–cyclen conjugate is described. Preliminary results showed that the adenine–cyclen conjugate can bind Zn 2+ rapidly in water and the Zn(II) complex can selectively recognize uracil and uridine. The recognition abilities have been demonstrated directly by UV spectrophotometric titration, NMR titration, and ESI-MS. The apparent 1:2 complex for uracil with the complex 5 was determined by spectrophotometric titration and ESIMS at pH 8.2 with I = 0.1 (NaNO3).

The conjugate of adenine–cyclen Zn(II) complex: its synthesis and selective recognition abilities for uracil and uridine