期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 18, 期 30, 页码 20085-20090出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6cp03290g
关键词
-
资金
- NSF
- NASA Astrobiology Program, under the NSF Center for Chemical Evolution [CHE-1504217]
- Earth-Life Science Institute (ELSI)
- ELSI Origins Network (EON)
- John Templeton Foundation
- JSPS KAKENHI
- Grants-in-Aid for Scientific Research [26106003] Funding Source: KAKEN
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据