A Unified Mechanism on the Formation of Acenes, Helicenes, and Phenacenes in the Gas Phase
- Univ. of Hawaii at Manoa, Honolulu, HI (United States); University of Hawaii at Manoa
- Univ. of Hawaii at Manoa, Honolulu, HI (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Samara National Research Univ. (Russia)
- Samara National Research Univ. (Russia); Florida International Univ., Miami, FL (United States)
A unified low-temperature reaction mechanism on the formation of acenes, phenacenes, and helicenes—polycyclic aromatic hydrocarbons (PAHs) that are distinct via the linear, zigzag, and ortho-condensed arrangements of fused benzene rings—is illustrated. This mechanism is mediated through a barrierless, vinylacetylene mediated gas-phase chemistry utilizing tetracene, [4]phenacene, and [4]helicene as benchmarks contesting established ideas that molecular mass growth processes to PAHs transpire at elevated temperatures. This mechanism opens up an isomer-selective route to aromatic structures involving submerged reaction barriers, resonantly stabilized free-radical intermediates, and systematic ring annulation potentially yielding molecular wires along with racemic mixtures of helicenes in deep space. Thus, connecting helicene templates to the Origins of Life ultimately changes our hypothesis on interstellar carbon chemistry.
- Research Organization:
- Florida International Univ., Miami, FL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Univ. of Hawaii, Honolulu, HI (United States)
- Sponsoring Organization:
- Ministry of Science and Higher Education of the Russian Federation; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division
- Grant/Contract Number:
- AC02-05CH11231; FG02-03ER15411; FG02-04ER15570
- OSTI ID:
- 1603233
- Journal Information:
- Angewandte Chemie (International Edition), Journal Name: Angewandte Chemie (International Edition) Journal Issue: 10 Vol. 59; ISSN 1433-7851
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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