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“Sixteen benzene rings” describes dodecaphenyltetracene, a molecule reported in 2019—not an acene with 16 rings fused in a line. It has a four-ring tetracene core surrounded by 12 attached phenyl rings. The distinction explains both the headline’s “bulkiest” wording and why the molecule is not the longest acene.
How the molecule adds up to 16 benzene rings
Acenes are built from benzene rings fused edge-to-edge in a straight sequence. Tetracene, the core of this molecule, has four such fused rings. Dodecaphenyltetracene adds 12 phenyl substituents—each a benzene ring attached to the core—bringing the total count to 16.
The added rings sit perpendicular to the tetracene core and surround it. They are not fused into the acene backbone, so the molecule is a heavily substituted tetracene rather than a 16-ring acene. Chemistry World’s 2019 report describes the arrangement as a protective “picket fence.”
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsWhy the 2019 report called it the bulkiest acene
The description referred to steric crowding: the 12 phenyl groups crowd and shield the tetracene core. It did not mean the researchers had made the longest chain of fused benzene rings. Chemistry World reported the compound as the most sterically crowded acene made at that time, based on work led by Robert Pascal at Tulane University.
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The team reported a three-step synthesis. The molecule was described as deep red and highly luminescent, while its electronic structure remained essentially like that of unsubstituted tetracene. The report also gave an end-to-end twist of 97° and an estimated one-second half-life for each enantiomer, reflecting how readily the two forms interconvert. These figures are those reported in the 2019 news account of the study.
Is it the longest acene?
No. “Bulkiest” and “longest” measure different things. A bulky derivative can have many substituents around a short fused core; a long acene has many rings fused in sequence. Later reviews discuss substantially longer acenes: a 2024 review identified tridecacene as the largest acene at the time it was published. That description concerns fused acene length, not a contest in substituent bulk.
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Long acenes are challenging to study, and reviews describe specialized approaches to their synthesis and characterization. A comparison therefore needs to distinguish the fused-ring count, substituent arrangement, and conditions under which each molecule was prepared or studied. The available accounts do not establish whether a later compound has surpassed dodecaphenyltetracene’s specific steric-bulk characterization.
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What the result does—and does not—show
The phenyl groups’ shielding effect and the reported tetracene-like electronic structure make the molecule scientifically interesting. Acenes as a broader family have optoelectronic properties that may be relevant to sensors and electronic components; pentacene, for example, is used as a semiconductor in organic electronics. Those broader possibilities are not demonstrated applications for dodecaphenyltetracene itself. The 2019 report said the molecule had no immediate practical use.
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Sources
- Katrina Krämer, “16 benzene rings make up bulkiest ever acene”, Chemistry World, 8 March 2019. The report cites Y. Xiao and colleagues, Angewandte Chemie International Edition 58 (2019), p. 2831, DOI: 10.1002/anie.201812418.
- Christina Tönshoff and Holger F. Bettinger, “Pushing the Limits of Acene Chemistry: The Recent Surge of Large Acenes”, Chemistry – A European Journal, first published 28 December 2020; issue 2021, 27, 3193–3212.
- “The Journey for the Synthesis of Large Acenes”, Chemistry – A European Journal, first published 30 July 2024, 30, e202402122.
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