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Keywords:

  • cleavage reactions;
  • copper;
  • fluorescent probes;
  • two-photon spectroscopy;
  • xanthone
Thumbnail image of graphical abstract

Out of the blue: A reaction-based two-photon probe XanCu (see scheme) is reported for the selective detection of Cu+ in reducing aqueous environments. Copper(I)-mediated oxidative benzylic ether (C[BOND]O) bond cleavage offers “switch-on” detection of the metal ion.