Revisiting Acepleiadylene: Two-Step Synthesis and π-Extension toward Nonbenzenoid Nanographene
- Pengcai LiuPengcai LiuState Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, ChinaMore by Pengcai Liu
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- Xing-Yu ChenXing-Yu ChenState Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, ChinaMore by Xing-Yu Chen
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- Jiawen CaoJiawen CaoState Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, ChinaMore by Jiawen Cao
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- Lukas RuppenthalLukas RuppenthalDepartment of Chemistry, Philipps University Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, GermanyMore by Lukas Ruppenthal
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- J. Michael GottfriedJ. Michael GottfriedDepartment of Chemistry, Philipps University Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, GermanyMore by J. Michael Gottfried
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- Klaus MüllenKlaus MüllenMax Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, GermanyMore by Klaus Müllen
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- Xiao-Ye Wang*Xiao-Ye Wang*Email: [email protected]State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, ChinaMore by Xiao-Ye Wang
Abstract

Acepleiadylene (APD), a nonbenzenoid nonalternant isomer of pyrene, exhibits different electronic properties from pyrene, but has been rarely studied since its first synthesis in 1956, probably due to the difficulties in synthesis and further derivatization. In this work, we revisited this long-known compound and developed a new two-step synthetic route to efficiently access APD on the gram scale. Theoretical and experimental characterizations elucidated the unique properties of APD as compared with its benzenoid isomer pyrene, particularly revealing its dipolar structure with a narrow optical gap. The functionalization of APD was demonstrated for the first time, providing doubly brominated APD as a key precursor for further π-extension. As a proof of concept, a π-extended APD and a cyclotrimer nanographene (C48H24) were constructed, opening up new avenues to nonbenzenoid nanographenes with low HOMO–LUMO gaps.
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