Synthesis of Anthracene‐Based Mechanofluorochromic Molecules and Their Differential Mechanochromic Effects Triggered by Nitrogen Atoms

To investigate the influence of nitrogen atoms on the mechanofluorochromic (MFC) properties, three novel anthracene‐based MFC compounds were designed and synthesized, and the effects of nitrogen atom position changes on their photophysical properties and MFC properties were deeply explored. The structure of the three compounds maintains the anthracene and enone portions unchanged, with only subtle adjustments made to the position of the nitrogen atom in the pyridine moiety. Experimental verification revealed that these three anthracene‐based compounds exhibit almost identical photophysical properties in solution but display significantly different fluorescence colors and distinct MFC properties in the solid state. The findings of this study not only offer a new perspective for understanding the MFC mechanism of anthracene‐based compounds but also provide valuable insights for the design and development of novel MFC molecules.