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Keywords:

  • diazapentalene;
  • near-infrared;
  • halochromic;
  • thermochromic
Thumbnail image of graphical abstract

A series of 2,5-diazapentalene containing dyes with tunable energy gaps are visible and near-infrared halochromic towards various acids and their protonated counterparts represent a new class of thermochromic materials with the near-infrared absorption being switched on at room temperature and off above 50 °C.