Journal
CHEM
Volume 4, Issue 7, Pages 1586-1595Publisher
CELL PRESS
DOI: 10.1016/j.chempr.2018.03.020
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Funding
- Ministry of Education Tier 3 programme [MOE2014-T3-1-004]
- Spanish Government (MINECO-FEDER project) [CTQ2016-80955]
- CONACyT-Mexico [591700]
- Global Research Laboratory through the National Research Foundation of Korea - Ministry of Science, ICT (Information and Communication Technologies), and Future Planning [2013K1A1A2A02050183]
- [IT588-13]
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pi-Conjugated molecules with an annulene-within-an-annulene (AWA) super-ring structure have been pursued by chemists for a long time but with limited success. Here, we report the synthesis of two stable cyclopenta-ring-fused oligo(m-phenylene) macrocycles, 8MC-M and 10MC-M, both showing moderate polyradical character. The octaradicaloid 8MC-M exhibits a [24] annulenewithin-[32]annulene structure, which is globally aromatic despite the fact that it possesses 4n pi-electrons. Theoretical analyses reveal that the pi-electrons in the inner and outer rings follow Baird's rule such that both are triplet biradicals, and overall the molecule is a ground-state spin singlet. The decaradicaloid 10MC-M also possesses a super-aromatic AWA structure with 30 and 40 pi-electrons in the inner and outer rings, respectively. However, it has a triplet ground state with a singlet inner ring satisfying Huckel's rule and a triplet outer ring following Baird's rule. Therefore, molecules with a decoupled AWA super-ring structure are eventually attained and also show unusual global aromaticity.
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