Seeing Is Believing:A Wavy N-Heteroarene with 20 Six-Membered Rings Linearly Annulated in a Row

Structurally well-defined arenes with higher numbers of linearly-fused six-member rings(n≥10)are important and highly desirable not only because of their experimental challenges but also due to their fundamental interests and the curiosity of their structure-property relationships.In this research,we successfully synthesized a novel large N-heteroarene(N20)with 20 linearly-fused six-membered rings,which is the longest N-heteroarene(4.7 nm)confirmed by single-crystal X-ray diffraction(SCXRD)analysis so far.The as-prepared arene displays a wave-like framework rather than a rigid plane.Moreover,N20 shows high molar absorptivity of 364,000 M^(−1) cm^(−1) with its fluorescence extended to the near-infrared region.