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Low-temperature formation of pyridine and (iso)quinoline via neutral–neutral reactions
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Low-temperature formation of pyridine and (iso)quinoline via neutral–neutral reactions
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Journal Article
Low-temperature formation of pyridine and (iso)quinoline via neutral–neutral reactions
2024
Overview
Aromatic molecules represent fundamental building blocks in prebiotic chemistry and are contemplated as vital precursors to DNA and RNA nitrogen bases. However, despite the identification of some 300 molecules in extraterrestrial environments, the pathways to pyridine (C
5
H
5
N), pyridinyl (C
5
H
4
N·) and (iso)quinoline (C
9
H
7
N)—the simplest representative mono- and bicyclic aromatic molecules carrying nitrogen—are elusive. Here we afford compelling evidence on the gas-phase formation of methylene amidogen (H
2
CN·) and cyanomethyl (H
2
CCN·) radicals via molecular beam studies and electronic structure calculations. The modelling of the chemistries of the Taurus molecular cloud (TMC-1) and Titan’s atmosphere contemplates a complex chain of reactions synthesizing pyridine, pyridinyl and (iso)quinoline from H
2
CN· and H
2
CCN· at levels of up to 75%. This study affords unique entry points to precursors of DNA and RNA nitrogen bases in hydrocarbon-rich extraterrestrial environments thus changing the way we think about the origin of prebiotic molecules in our Galaxy.
A pathway towards the formation of pyridine and (iso)quinoline, precursors to DNA and RNA, is revealed for conditions appropriate to Saturn’s moon Titan and the Taurus molecular cloud, providing insight into the synthesis of prebiotic molecules in space.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Springer Nature
Subject
