A novel ditopic fluorescent chemosensor 2, based on the 1,3-alternate conformation of thiacalix[4]crown possessing two complexation sites, was synthesized and shows ratiometric nanomolar detection of Cu2+ ions and exhibits negative allosteric behaviour between Cu2+/Li+ ions in mixed aqueous media.
![Graphical abstract: Ratiometric nanomolar detection of Cu2+ ions in mixed aqueous media: a Cu2+/Li+ ions switchable allosteric system based on thiacalix[4]crown](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C2DT31081C&imageInfo.ImageIdentifier.Year=2012)
M. Kumar, N. Kumar and V. Bhalla, Dalton Trans., 2012, 41, 10189 DOI: 10.1039/C2DT31081C
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