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Keywords:

  • EXAFS spectroscopy;
  • ion exchange;
  • luminescence;
  • metal–organic frameworks;
  • polyoxometalates
Thumbnail image of graphical abstract

X-ray spectroscopy: Substoichiometric encapsulation of polyoxometalate ions into a metal–organic framework results in a fully functional cation exchanger with accessible porosity. Cu2+ cations compensating the charge of [PW12O40]3− in the as-synthesized material can be exchanged with cations such as Na+ and Eu3+. When exchanged with Eu3+, the material appears bright red under UV irradiation (see figure).