Abstract
Considering the great advantages of boron 2-(2′-pyridyl)imidazole (BOPIM) based dyes, such as facile synthesis, high fluorescence quantum yield, large Stokes shift, and good thermal stability, three BOPIM complexes (BOMPIM-Ph, BOPIM-Th, and BOPIM-TTh) with different aromatic side groups have been developed. Their crystal structures and photophysical and mechanochromic luminescence properties were systematically studied. It was found that their solid state emission and mechanochromic behaviors are related to the side group. High color contrast reversible mechanochromism and piezochromism were observed for the three analogues, while BOPIM-TTh with more bulky thienothiophene groups showed a more sensitive and pronounced mechanochromic response. Steric and electronic effects of the aromatic donating substitutes were proved playing significant roles in regulating the intermolecular interactions and intramolecular charge transfer effect. Fine-tuning the molecular structures of such kind of BOPIM dyes allows con...
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