A cell-permeable ytterbium complex shows reversible binding with Hg 2+ in aqueous solution and in vitroby off–on visible and NIR emission. The fast response and 150 nM sensitivity of Hg 2+ detection is based upon FRET and the lanthanide antenna effect. The reversible Hg 2+ detection can be performed in vitro, and the binding mechanism is suggested by NMR employing the motif structure in a La complex and by DFT calculations.
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Bao et al. (2017) studied this question.
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