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• W2065735596 endingPage "10504" @default.
• W2065735596 startingPage "10493" @default.
• W2065735596 abstract "A fluorescent heteroditopic indicator for the zinc(II) ion possesses two different zinc(II) binding sites. The sequential coordination of zinc(II) at the two sites can be transmitted into distinct fluorescence changes. In the heteroditopic ligand system that our group developed, the formations of mono- and dizinc(II) complexes along an increasing gradient of zinc(II) concentration lead to fluorescence enhancement and an emission bathochromic shift, respectively. The extents of these two changes determine the sensitivity and, ultimately, the effectiveness of the heteroditopic indicator in quantifying zinc(II) ion over a large concentration range. In this work, a strategy to increase the degree of fluorescence enhancement upon the formation of the monozinc(II) complex of a heteroditopic ligand under simulated physiological conditions is demonstrated. Fluorination of the pyridyl groups in the pentadentate N,N,N′-tris(pyridylmethyl)ethyleneamino group reduces the apparent pKa value of the high-affinity site, which increases the degree of fluorescence enhancement as the monozinc(II) complex is forming. However, fluorination impairs the coordination strength of the high-affinity zinc(II) binding site, which in the triply fluorinated ligand reduces the binding strength to the level of the low-affinity 2,2′-bipyridyl. The potential of the reported ligands in imaging zinc(II) ion in living cells was evaluated. The subcellular localization properties of two ligands in five organelles were characterized. Both benefits and deficiencies of these ligands were revealed, which provides directions for the near future in this line of research." @default.
• W2065735596 created "2016-06-24" @default.
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• W2065735596 date "2011-09-12" @default.
• W2065735596 modified "2023-10-14" @default.
• W2065735596 title "Balance between Fluorescence Enhancement and Association Affinity in Fluorescent Heteroditopic Indicators for Imaging Zinc Ion in Living Cells" @default.
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• W2065735596 doi "https://doi.org/10.1021/ic201728f" @default.
• W2065735596 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3190650" @default.
• W2065735596 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/21905758" @default.
• W2065735596 hasPublicationYear "2011" @default.

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