Is formamide a geochemically plausible prebiotic solvent?

TitleIs formamide a geochemically plausible prebiotic solvent?
Publication TypeJournal Article
Year of Publication2016
AuthorsBada JL, Chalmers J.H, Cleaves H.J
JournalPhysical Chemistry Chemical Physics
Volume18
Pagination20085-20090
Date Published2016/08
Type of ArticleArticle
ISBN Number1463-9076
Accession NumberWOS:000381428600007
Keywordsadenine; degradation; density; life; origin; purine; rna; viscosity; water; zone
Abstract

From a geochemical perspective, significant amounts of pure formamide (HCONH2) would have likely been rare on the early Earth. There may have been mixed formamide-water solutions, but even in the presence of catalyst, solutions with >= 20 weight% water in formamide would not have produced significant amounts of prebiotic compounds. It might be feasible to produce relatively pure formamide by a rare occurrence of freezing formamide/water mixtures at temperatures lower than formamide's freezing point (2.55 degrees C) but greater than the freezing point of water. Because of the high density of formamide ice it would have sunk and accumulated at the bottom of the solution. If the remaining water froze on the surface of this ice, and was then removed by a sublimation-ablation process, a small amount of pure formamide ice might have been produced. In addition a recent report suggested that similar to 85 weight% formamide could be prepared by a geochemical type of fractional distillation process, offering another possible route for prebiotic formamide production.

DOI10.1039/c6cp03290g
Short TitlePhys. Chem. Chem. Phys.
Student Publication: 
No
Research Topics: 
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