BN-Isosteres of Nonacene with Antiaromatic B 2 C 4 and N 2 C 4 Heterocycles: Synthesis and Strong Luminescence
Embedding both boron and nitrogen into the backbone of acenes to generate their isoelectronic structures has significantly enriched the acene chemistry to offer appealing properties. However, only small BN-heteroacenes have been extensively investigated, with BN-heptacenes as the hitherto longest ho...
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Published in | Angewandte Chemie International Edition Vol. 63; no. 11; p. e202316596 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Germany
11.03.2024
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Abstract | Embedding both boron and nitrogen into the backbone of acenes to generate their isoelectronic structures has significantly enriched the acene chemistry to offer appealing properties. However, only small BN-heteroacenes have been extensively investigated, with BN-heptacenes as the hitherto longest homologue. Herein, we report the synthesis of three new nonacene BN-isosteres via incorporating a pair of antiaromatic B
C
and N
C
heterocycles, representing a new length record for BN-heteroacenes. The distance between the B
C
and N
C
rings affects the contribution of the charge-separated resonance forms, leading to tunable antiaromaticity of the two heterocycles. The adjusted local antiaromaticity manifests substantial influence on the molecular orbital arrangement, and consequently, the radiative transition rate of BN-3 is greatly enhanced compared with BN-1 and BN-2, realizing a high fluorescence quantum yield of 92 %. This work provides a novel design concept of large acene BN-isosteres and reveals the importance of BN/CC isosterism on their luminescent properties. |
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AbstractList | Embedding both boron and nitrogen into the backbone of acenes to generate their isoelectronic structures has significantly enriched the acene chemistry to offer appealing properties. However, only small BN-heteroacenes have been extensively investigated, with BN-heptacenes as the hitherto longest homologue. Herein, we report the synthesis of three new nonacene BN-isosteres via incorporating a pair of antiaromatic B
C
and N
C
heterocycles, representing a new length record for BN-heteroacenes. The distance between the B
C
and N
C
rings affects the contribution of the charge-separated resonance forms, leading to tunable antiaromaticity of the two heterocycles. The adjusted local antiaromaticity manifests substantial influence on the molecular orbital arrangement, and consequently, the radiative transition rate of BN-3 is greatly enhanced compared with BN-1 and BN-2, realizing a high fluorescence quantum yield of 92 %. This work provides a novel design concept of large acene BN-isosteres and reveals the importance of BN/CC isosterism on their luminescent properties. |
Author | Chang, Zhi-Dong Chen, Cheng Huang, Yan-Bo Guo, Yong-Kang Wang, Xiao-Ye |
Author_xml | – sequence: 1 givenname: Cheng surname: Chen fullname: Chen, Cheng organization: State Key Laboratory of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China – sequence: 2 givenname: Zhi-Dong surname: Chang fullname: Chang, Zhi-Dong organization: State Key Laboratory of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China – sequence: 3 givenname: Yong-Kang surname: Guo fullname: Guo, Yong-Kang organization: State Key Laboratory of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China – sequence: 4 givenname: Yan-Bo surname: Huang fullname: Huang, Yan-Bo organization: State Key Laboratory of Elemento-Organic Chemistry, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, 300071, Tianjin, China – sequence: 5 givenname: Xiao-Ye orcidid: 0000-0003-3540-0277 surname: Wang fullname: Wang, Xiao-Ye organization: Beijing National Laboratory for Molecular Sciences, Beijing, 100190, China |
BackLink | https://www.ncbi.nlm.nih.gov/pubmed/38216533$$D View this record in MEDLINE/PubMed |
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Title | BN-Isosteres of Nonacene with Antiaromatic B 2 C 4 and N 2 C 4 Heterocycles: Synthesis and Strong Luminescence |
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