ON THE FORMATION OF AMIDE POLYMERS VIA CARBONYL–AMINO GROUP LINKAGES IN ENERGETICALLY PROCESSED ICES OF ASTROPHYSICAL RELEVANCE
ON THE FORMATION OF AMIDE POLYMERS VIA CARBONYL–AMINO GROUP LINKAGES IN ENERGETICALLY PROCESSED ICES OF ASTROPHYSICAL RELEVANCE
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DOI：
10.3847/0004-637x/820/2/117
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发表时间：
2016-03
期刊：
影响因子：
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通讯作者：
M. Förstel;Pavlo Maksyutenko;B. Jones;B. Sun;Huan C. Lee;A. Chang;R. Kaiser
中科院分区：
文献类型：
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作者：
M. Förstel;Pavlo Maksyutenko;B. Jones;B. Sun;Huan C. Lee;A. Chang;R. Kaiser
我们报道了通过一氧化碳和氨中的羰基-氨基连接形成具有天体物理意义的含能加工冰块的有机酰胺聚合物。第一族包括具有一个羧基和以甲酰胺(45u)、尿素(60u)和联氨甲酰胺(75u)开始的数目不断增加的胺部分的分子。第二组由具有两个羧基(58u)和最多三个胺基(73u、88u和103u)的物种组成。在天体物理和天体生物学的背景下讨论了从简单的无机分子通过甲酰胺和尿素到酰胺聚合物的形成和聚合。我们的结果表明，与多肽密切相关的长链分子很容易在很低的温度下通过能量处理简单的无机冰而形成，并可以通过升华恒星形成区的冰而释放到气相中。我们的实验结果是通过反射飞行时间质谱学和软单光子真空紫外光电离相结合得到的，并得到了理论计算的补充。
We report on the formation of organic amide polymers via carbonyl–amino group linkages in carbon monoxide and ammonia bearing energetically processed ices of astrophysical relevance. The first group comprises molecules with one carboxyl group and an increasing number of amine moieties starting with formamide (45 u), urea (60 u), and hydrazine carboxamide (75 u). The second group consists of species with two carboxyl (58 u) and up to three amine groups (73 u, 88 u, and 103 u). The formation and polymerization of these linkages from simple inorganic molecules via formamide und urea toward amide polymers is discussed in an astrophysical and astrobiological context. Our results show that long chain molecules, which are closely related to polypeptides, easily form by energetically processing simple, inorganic ices at very low temperatures and can be released into the gas phase by sublimation of the ices in star-forming regions. Our experimental results were obtained by employing reflectron time-of-flight mass spectroscopy, coupled with soft, single photon vacuum ultraviolet photoionization; they are complemented by theoretical calculations.