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Keywords:

  • fluorescent probes;
  • molecular rotors;
  • nucleosides;
  • polarity;
  • viscosity
Thumbnail image of graphical abstract

Sticky fingers: The emission intensity of modified pyrimidines containing an aryl moiety, linked by a single bond to the nucleobase in the 5-position, show a remarkable sensitivity to sample viscosity (see picture), a trait typical for chromophores bearing a molecular rotor element.