论文标题
高度极性五元环氰基戊二烯的星际检测
Interstellar Detection of the Highly Polar Five-Membered Ring Cyanocyclopentadiene
论文作者
论文摘要
就像六元环一样，有机化学中的五个元素无处不在，经常充当大分子的基础，包括许多生化重要性。 From a combination of laboratory rotational spectroscopy and a sensitive spectral line survey in the radio band toward the starless cloud core TMC-1, we report the astronomical detection of 1-cyano-1,3-cyclopentadiene, $c$-C$_5$H$_5$CN}, a highly polar, cyano derivative of cyclopentadiene, $ c $ -c $ _5 $ h $ _6 $。 $ c $ -c $ _5 $ h $ _5 $ cn}的派生丰度远远超过天文学模型所预测的，这些模型可以很好地繁殖许多碳链。这一发现意味着可能需要考虑重要的生产机制或大量芳香材料储层。显然缺乏与其密切相关的异构体2-Cyano-1,3-循环丙烯，可能是由于其较低的稳定性而引起的，或者表明形成1-氰基异构体的更选择性途径，也许是从千合性前体开始的。根据天文学发现，讨论了吡咯和吡啶等N型型细胞（例如吡咯和吡啶的）。
Much like six-membered rings, five-membered rings are ubiquitous in organic chemistry, frequently serving as the building blocks for larger molecules, including many of biochemical importance. From a combination of laboratory rotational spectroscopy and a sensitive spectral line survey in the radio band toward the starless cloud core TMC-1, we report the astronomical detection of 1-cyano-1,3-cyclopentadiene, $c$-C$_5$H$_5$CN}, a highly polar, cyano derivative of cyclopentadiene, $c$-C$_5$H$_6$. The derived abundance of $c$-C$_5$H$_5$CN} is far greater than predicted from astrochemical models which well reproduce the abundance of many carbon chains. This finding implies either an important production mechanism or a large reservoir of aromatic material may need to be considered. The apparent absence of its closely-related isomer, 2-cyano-1,3-cyclopentadiene, may arise from its lower stability or be indicative of a more selective pathway for formation of the 1-cyano isomer, perhaps one starting from acyclic precursors. The absence of N-heterocycles such as pyrrole and pyridine is discussed in light of the astronomical finding.
