MURAL - Maynooth University Research Archive Library



    A long wavelength colourimetric chemosensor for fluoride


    Marchetti, Luke A. and Mao, Nan and Krämer, Tobias and Kitchen, Jonathan A. and Elmes, Robert B.P. (2018) A long wavelength colourimetric chemosensor for fluoride. Supramolecular Chemistry, 30 (9). pp. 795-805. ISSN 1061-0278

    [img]
    Preview
    Download (2MB) | Preview


    Share your research

    Twitter Facebook LinkedIn GooglePlus Email more...



    Add this article to your Mendeley library


    Abstract

    A family of chemosensors based on the squaramidoquinoxaline moiety (cyclobuta[b]quinoxaline-1,2(3H,8H)-dione) (1–3) have been assembled by a simple room temperature one step synthesis. X-ray crystallographic analysis of 2 demonstrated both strong hydrogen bond donor ability and tendency to π stack in the solid state. Moreover, Compound 2, with its strongly electron withdrawing nitro-substituent, showed an obvious F− selective colour change (when measured against other halides) clearly visible to the naked eye from pink to green in DMSO solution. Further addition of F− led to a second colour change from green to yellow. Using TD-DFT, UV/Vis and NMR analysis we conclude that the observed colour changes are likely to be due to a two-step process involving two NH deprotonation steps. Colour changes of 1 and 3 were not as apparent in the presence of F− owing to the reduced acidity of the NH functionality of the squaramidoquinoxaline. The results of this study again demonstrate the use of squaramide derivatives as valuable building blocks in the field of anion recognition and demonstrate that the electron withdrawing aryl substituent is directly related to the sensing ability/acidity of the squaramide protons and can be used to tune their anion recognition behavior.

    Item Type: Article
    Keywords: Anion sensing; squaramide; colorimetric; fluoride;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 12529
    Identification Number: https://doi.org/10.1080/10610278.2018.1461873
    Depositing User: Robert Elmes
    Date Deposited: 05 Mar 2020 17:04
    Journal or Publication Title: Supramolecular Chemistry
    Publisher: Taylor & Francis
    Refereed: Yes
    URI:

    Repository Staff Only(login required)

    View Item Item control page

    Downloads

    Downloads per month over past year