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  • Title: Naked-eye recognition of Cu(II), Zn(II) and acetate ion by the first guanine-based difunctional chromoinophore.
    Author: Upadhyay KK, Kumar A, Zhao J, Mishra RK.
    Journal: Talanta; 2010 Apr 15; 81(1-2):714-21. PubMed ID: 20188987.
    Abstract:
    The first guanine-based difunctional colorimetric receptor 8-[(4-nitrophenyl)azo]guanine (receptor 1) was designed, synthesized and characterized by IR, UV-vis, (1)H NMR and mass spectrometric analysis. The synthesized receptor 1 was able to recognize Cu(II), Zn(II) and acetate ion through visible color changes in its DMSO and DMSO-H(2)O (95:5, v/v) solution. The binding affinity of the receptor 1 with the chosen analytes has been estimated in terms of binding constants through non-linear fittings of corresponding UV-vis titration data while the binding mode of the same was studied through (1)H NMR spectral studies.
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