Journal
MATERIALS CHEMISTRY FRONTIERS
Volume 2, Issue 8, Pages 1456-1461Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8qm00168e
Keywords
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Funding
- National Natural Science Foundation of China [21522203]
- National Key R&D Program of China [2017YFA0204903]
- Fundamental Research Funds for the Central Universities [lzujbky-2016-ct06]
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A series of hetero polycycles (5a-6b) are created through the hybridization of the bowl-shaped trichalcogenasumanenes and planar triazacoronene. Among them, 6a and 6b bear the 2,2-bipyridine (bpy) ligand in the lateral direction. The crystallographic analyses show that 6a and 6b possess planar cores, whereas they are driven to bowl-shaped (bowl depth, 0.38-0.50 angstrom) via chelation of Zn2+ by the bpy unit at room temperature (RT). This is caused by the formation of a five-membered ring upon coordination with Zn2+. The coordination of Zn2+ also brings distinct variation of the optical properties, i.e., the crystals of 6a and 6a[ZnCl2] respectively show green and red fluorescence. Moreover, 5a-6b exhibit a reversible color change and a fluorescence OFF/ON response upon acidification and neutralization. Owing to the multiple protonation process, 6a and 6b display a gradient color change from yellow to magenta, violet, and blue as the amount of acid increases. These new hetero polycycles (5a-6b) have potential applications as chemosensors and/or switches.
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