Affiliation:
1. Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids CAS Center of Excellence in Molecular Science Institute of Chemistry Chinese Academy of Sciences 100190 Beijing China
2. School of Chemical Sciences University of Chinese Academy of Sciences 100049 Beijing China
3. College of Chemistry and Molecular Engineering Peking University 100871 Beijing China
4. State Key Laboratory of Applied Organic Chemistry Lanzhou University 730000 Lanzhou China
Abstract
AbstractNon‐benzenoid polycyclic aromatic hydrocarbons (PAHs) have received a lot of attention because of their unique optical, electronic, and magnetic properties, but their synthesis remains challenging. Herein, we report a non‐benzenoid isomer of peri‐tetracene, diazulenorubicene (DAR), with two sets of 5/7/5 membered rings synthesized by a (3+2) annulation reaction. Compared with the precursor containing only 5/7 membered rings, the newly formed five membered rings switch the aromaticity of the original heptagon/pentagon from antiaromatic/aromatic to non‐aromatic/antiaromatic respectively, modify the intermolecular packing modes, and lower the LUMO levels. Notably, compound 2 b (DAR‐TMS) shows p‐type semiconducting properties with a hole mobility up to 1.27 cm2 V−1 s−1. Moreover, further extension to larger non‐benzenoid PAHs with 19 rings was achieved through on‐surface chemistry from the DAR derivative with one alkynyl group.
Funder
National Natural Science Foundation of China
CAS-Croucher Funding Scheme for Joint Laboratories
Youth Innovation Promotion Association of the Chinese Academy of Sciences
Chinese Academy of Sciences