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As a powerful macrocyclic host molecule with unique conformation and cavity structure that are fine-tuned by the bridging nitrogen atoms, methylazacalix[4]pyridine (MACP-4) has been shown to selectively recognize Zn2+ and form stable Zn(Ⅱ)-MACP-4 complexes both in solid state and solution with an association constant up to 5.97 (logKs). The molecular recognition of Zn(Ⅱ)-MACP-4 complexes towards various amino acids and anions with different geometry was investigated by using the spectral titration methods and X-ray analysis. The Zn(Ⅱ)-MACP-4 complex was found to recognize the 17 amino acids tested with the association constant up to 3.97 (logKs). On the other hand, the Zn(Ⅱ)-MACP-4 complex selectively interacted with anions and the maximum association constant of 3.9 (logKs) was obtained.
As a powerful macrocyclic host molecule with unique conformation and cavity structure that are fine-tuned by the bridging nitrogen atoms, methylazacalix [4] pyridine (MACP-4) has been shown to selectively recognize Zn 2+ and form stable Zn (II) -MACP- 4 complexes both in solid state and solution with an association constant up to 5.97 (log Ks). The molecular recognition of Zn (II) -MACP-4 complexes towards various amino acids and anions with different geometry was investigated by using the spectral titration methods and The Zn (II) -MACP-4 complex was found to recognize the 17 amino acids tested with the association constant up to 3.97 (log Ks). On the other hand, the Zn (II) -MACP-4 complex selectively interacted with anions and the maximum association constant of 3.9 (logKs) was obtained.