六边形
化学
科罗尼
杂原子
分子
吸收(声学)
共轭体系
荧光
接受者
光化学
结晶学
聚合物
有机化学
光学
戒指(化学)
物理
凝聚态物理
作者
Xin‐Jing Zhao,Yang‐Yang Ju,Yu-Ming Su,Chun Tang,Zhang Qi,Liubin Feng,Cheng Wang,Kläus Müllen,Yuan‐Zhi Tan
摘要
The conventional approach toward molecules with large two-photon absorption (TPA) involves donor–acceptor conjugation. Herein we show a new strategy involving the use of hexa-branched nanographenes. We synthesized two hexa-branched nanographenes, one with six benzoaceanthrylene arms fused to the coronene core and the other with six pyrenyl arms fused to the coronene core. Neither of these hexa-branched nanographenes has a donor–acceptor structure, yet they exhibited high TPA values of 3.6 × 103 and 1.9 × 104 GM, respectively, which are the highest values recorded for heteroatom-free hydrocarbon molecules. Theoretical analysis suggests that the fused branched structures are responsible for the large TPA cross-section. These findings illustrate the importance of the topology of the fused conjugated skeleton in TPA and provide an alternative structural design toward large TPA.
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