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  • 1
    Electronic Resource
    Electronic Resource
    The Molecular Design of Fluorescent Sensors for Ionic Analytes (1998)
    Springer
    Journal of fluorescence 8 (1998), S. 263-271 
    Details
    ISSN: 1573-4994
    Keywords: Fluorosensors ; electron transfer ; anthracene ; metal ions ; amino acids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Molecular fluorescent sensors can be synthesized by covalently linking a photoactive fragment (e.g., anthracene) to a receptor subunit displaying affinity toward the envisaged substrate. The electron transfer process is the privileged signal transduction mechanism: redox active substrates (e.g., transition metals) typically release/uptake an electron to/from the proximate photoexcited fluorophore, the recognition being signaled through fluorescence quenching; redox inactive substrates (d0 and d10 metals, H+) deactivate an existing quenching relay (e.g., a tertiary nitrogen atom close to the fluorophore) and their recognition is signaled through fluorescence enhancement. An-ionic substrates can be conveniently recognized on the basis of the metal–ligand interaction: polyamine receptors containing the photophysically inactive ZnIIion bind the carboxylate group. In the case of amino acids, $${\text{NH}}_3^ + {\text{ - CH(R) - COO}}^ -$$ , selectivity is improved when the receptor platform bears additional groups capable to interact specifically with the R substituent. If R is capable of transferring an electron to the nearby photoexcited fluorophore, the recognition is signaled through fluorescence quenching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022513918542
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A Versatile Fluorescent System for Sensing of H+, Transition Metals, and Aromatic Carboxylates (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 35-39 
    Details
    ISSN: 1434-1948
    Keywords: Fluorescent sensors ; Molecular recognition ; Charge transfer excited states ; Metal complexes ; pH Sensors ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fluorescent emission of the N,N-dimethylaniline fragment of the tetramine system 3varies with pH, displaying a maximum of the fluorescent intensity, IF, at pH = 5. Binding of transition metals (CuII, NiII) induces fluorescence quenching and modifies the IF vs. pH profile, giving rise to an OFF-ON-OFF type of sensor. The [ZnII(3)]2+complex recognises carboxylate anions, both aliphatic and aromatic. Recognition is signalled via fluorescence quenching only for aromatic carboxylates.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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