Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume -, Issue -, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.202203954
Keywords
circulene analogs; contorted pi-systems; helical chirality; polyseptanes; strain frameworks; triarylamines
Categories
Ask authors/readers for more resources
This study presents the synthesis, characterization, and properties of a heterocyclic compound containing three fused heptagon rings. The unique strained structure and self-assembly properties of the compound result in red-shifted absorption and concentration-dependent emission profiles. Additionally, the compound exhibits a lower oxidation potential compared to its non-bridged analog. This research opens up new avenues for understanding the structure-property relationships of curved pi-aromatics and constructing increasingly complex pi-frameworks.
The synthesis and characterization of heptagon-embedded polycyclic aromatic compounds are essential for understanding the effect of negative curvature on carbon allotropes such as fullerenes and graphenes that have applications in functional organic materials. However, owing to the synthetic difficulties in functionalizing and embedding seven-membered rings, these strain-challenged structures are relatively unexplored. We report here the synthesis, characterization, and properties of a triarylamine core bridged with ethano chains at the 2,2'-positions. In doing so, we provide access to the first heterocycle containing three fused heptagon rings with a nitrogen at its core (BATA-NHAc). X-ray crystallographic analysis and DFT calculations revealed a remarkably strained structure wherein two of the bridged aryl units approach coplanarity, while the third ring is twisted out of plane at 70 degrees. UV-vis and emission spectroscopies identify red-shifted absorption and concentration-dependent emission profiles, respectively, as a result of the unique conformation and self-assembly properties of BATA-NHAc. Furthermore, cyclic voltammetry shows a decrease in the oxidation potential for BATA-NHAc in comparison to the non-bridged analog. This study opens new avenues in understanding the structure-property relationships of curved pi-aromatics and the construction of pi-frameworks of increasing complexity.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available