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• W2016990533 abstract "New supramolecular ligands possessing linear 13- and 15-membered pyridine diamidetriamine chelators between the primary sides of two β-cyclodextrin cavities were synthesized, and characterized by MALDI-MS, NMR, IR and UV–Visible spectroscopy. Fluorescence and pH-metric titration were carried out in order to ascertain their behavior as bifunctional hosts for fluorescent guests and Cu(II) ion. The pKa value for the Cu(II) promoted deprotonation of amide ligands was determined to be 6.2 from pH-absorbance profile. Above pH 8.0, two deprotonated amides and three amino groups chelated Cu(II) ion, and yielded penta-coordinated Cu(II) complexes. The Cu(II) complexes catalyzed the hydrolysis of p-nitrophenyl acetate, adamantate and amino acids. Especially, the complex containing 13-membered chelator is an artificial metalloesterase with catalytic rate constant kcat=3.8 × 10−3 min−1 and Michaelis constant Km=3.5 × 10−4 M for the hydrolysis of p-nitrophenyl adamantate via metal-hydroxide mechanism." @default.
• W2016990533 created "2016-06-24" @default.
• W2016990533 creator A5007606574 @default.
• W2016990533 creator A5040365310 @default.
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• W2016990533 date "1998-09-01" @default.
• W2016990533 modified "2023-10-16" @default.
• W2016990533 title "Dimeric β-cyclodextrin-based supramolecular ligands and their copper(II) complexes as metalloenzyme models" @default.
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• W2016990533 doi "https://doi.org/10.1016/s0162-0134(98)10049-1" @default.
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