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Keywords:

  • DNA;
  • excimers;
  • fluorescence;
  • NMR spectroscopy;
  • π stacking
Thumbnail image of graphical abstract

A special stack: In the presence of K+ ions, a specific guanine-rich DNA sequence forms a stacked G-quadruplex dimer giving rise to excimer emission in the 400 nm region. This emission with nanosecond lifetime occurs only for a particular base overlap pattern between two stacked G-quadruplex blocks and can be manipulated by changing DNA sequence and external conditions.