Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 23, Issue 6, Pages 1409-1414Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201604662
Keywords
boron; cage compounds; heat resistance; mechanoluminescent chromism; organic-inorganic hybrid compounds
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Funding
- Research Institute for Production Development
- New Polymeric Materials Based on Element-Blocks [2401]
- JSPS KAKENHI [JP24102013, 15H00736]
- Grants-in-Aid for Scientific Research [17H01220, 16K14063, 17H03067, 15H00736] Funding Source: KAKEN
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The development of a heat-resistant mechanolu-minescent chromic (MLC) dye based on an organic-inorganic hybrid molecular scaffold is reported. Luminescent organoboron complexes were introduced into polyhedral oligomeric silsesquioxane (POSS) at each vertex through the rigid linker structure in the Suzuki-Miyaura cross-coupling reaction. From optical measurements, it was found that the crystalline state of the modified POSS showed orange emission. By adding mechanical forces to the sample, regular structures collapsed. Correspondingly, the emission color turned to yellow. Interestingly, the yellow-emissive amorphous state can be preserved during heating. By radially distributing luminescent chromophores on the rigid cube, both optical and thermal properties can be modulated to realize heat-resistant MLC behavior. POSS can contribute not only to expressing the MLC behavior, but also to improving thermal stability in the amorphous state. This is the first example, to the best of our knowledge, to offer the rational design of a heat-resistant MLC material.
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