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Reasons why life on Earth rarely makes fluorine-containing compounds and their implications for the search for life beyond Earth
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Reasons why life on Earth rarely makes fluorine-containing compounds and their implications for the search for life beyond Earth
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Journal Article
Reasons why life on Earth rarely makes fluorine-containing compounds and their implications for the search for life beyond Earth
2024
Overview
Life on Earth is known to rarely make fluorinated carbon compounds, as compared to other halocarbons. We quantify this rarity, based on our exhaustive natural products database curated from available literature. We build on explanations for the scarcity of fluorine chemistry in life on Earth, namely that the exclusion of the C–F bond stems from the unique physico-chemical properties of fluorine, predominantly its extreme electronegativity and strong hydration shell. We further show that the C–F bond is very hard to synthesize and when it is made by life its potential biological functions can be readily provided by alternative functional groups that are much less costly to incorporate into existing biochemistry. As a result, the overall evolutionary cost-to-benefit balance of incorporation of the C–F bond into the chemical repertoire of life is not favorable. We argue that the limitations of organofluorine chemistry are likely universal in that they do not exclusively apply to specifics of Earth’s biochemistry. C–F bonds, therefore, will be rare in life beyond Earth no matter its chemical makeup.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
