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    Luminescence anion sensing via modulation of MLCT emission from a naphthalimide-Ru(II)-polypyridyl complex


    Elmes, Robert B.P. and Gunnlaugsson, Thorfinnur (2010) Luminescence anion sensing via modulation of MLCT emission from a naphthalimide-Ru(II)-polypyridyl complex. Tetrahedron Letters, 51 (31). pp. 4082-4087. ISSN 0040-4039

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    Abstract

    The selective sensing of fluoride (F¯; an important breakdown product of some chemical warfare agents such as sarin) was achieved by observing quenching in the Metal to Ligand Charge Transfer (MLCT) emission of the 1,8-naphthalimide ruthenium conjugate Ru-Nap-NH2, which occurs at long wavelengths in CH3CN, using steady state fluorescence spectroscopy. The F¯ recognition was also visible to the naked eye, with a clear colour change from yellow to red. The sensing mechanism is most likely initially via hydrogen bonding, between the anion and the amine, which at higher concentrations, gives rise to deprotonation of the acidic 4-amino-1,8- naphthalimide moiety. However, counter ion effects may also be contributing to the overall emission changes. Other anions such as acetate, phosphate and chloride also give rise to quenching in the fluorescence emission with only minor changes in the UV-Vis absorption spectra of Ru-Nap-NH2. Moreover, phosphate also gave rise to shifts in the max in the emission spectra. © 2010 Elsevier Science. All rights reserved

    Item Type: Article
    Additional Information: This is the postprint version of the published article, which is available at DOI: 10.1016/j.tetlet.2010.05.127
    Keywords: Luminescence anion sensing; modulation; MLCT emission; naphthalimide-Ru(II)-polypyridyl complex;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 6993
    Identification Number: https://doi.org/10.1016/j.tetlet.2010.05.127
    Depositing User: Robert Elmes
    Date Deposited: 26 Feb 2016 16:56
    Journal or Publication Title: Tetrahedron Letters
    Publisher: Elsevier
    Refereed: Yes
    URI:

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