Thermal Processing and Interactions of Ethyl Formate in Model Astrophysical Ices Containing Water and Ethanol
Thermal Processing and Interactions of Ethyl Formate in Model Astrophysical Ices Containing Water and Ethanol
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DOI：
10.1021/acsearthspacechem.9b00091
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发表时间：
2019-08
影响因子：
3.4
通讯作者：
T. Salter;Lisa Wootton;W. A. Brown
中科院分区：
文献类型：
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作者：
T. Salter;Lisa Wootton;W. A. Brown
采用程序升温脱附（TPD）和反射吸收红外光谱（RAIRS）研究了吸附在石墨模型颗粒表面的模型天体物理冰中甲酸乙酯与水和乙醇之间的相互作用。实验表明，甲酸乙酯通过氧孤对电子与水和乙醇形成氢键。这导致观察到甲酸乙酯的C-O-O和C-O-C模式的振动波数的变化，这可能被用来在天文观测中识别这种复杂的有机分子的环境。TPD数据表明，甲酸乙酯与水的相互作用比与乙醇的更强，在TPD光谱中观察到的额外物种对应于直接结合到水冰表面的甲酸乙酯的解吸。吸附在水冰上的甲酸乙酯的脱附能为48.5 kJ mol-1，而纯甲酸乙酯的脱附能为43.2 kJ mol-1。
Temperature-programmed desorption (TPD) and reflection absorption infrared spectroscopy (RAIRS) have been used to investigate the interactions between ethyl formate and water and ethyl formate and ethanol in model astrophysical ices adsorbed on a graphitic model grain surface. Experiments show that the ethyl formate forms hydrogen bonds to both water and ethanol via the oxygen lone pairs. This leads to the observation of shifts in the vibrational wavenumber of the C═O and C—O—C modes of ethyl formate, which can potentially be used to identify the environment of this complex organic molecule in astronomical observations. TPD data show that the interaction of ethyl formate with water is stronger than that with ethanol with an additional species being observed in the TPD spectrum corresponding to the desorption of ethyl formate directly bonded to the water ice surface. The desorption energy of ethyl formate adsorbed on water ice was found to be 48.5 kJ mol–1, compared to 43.2 kJ mol–1 for pure ethyl formate ...