Department of Chemistry, University of Hawaii at Manoa, 2545 McCarthy Mall, Honolulu, HI, 96822, USA.
W. M. Keck Laboratory in Astrochemistry, University of Hawaii at Manoa, 2545 McCarthy Mall, Honolulu, HI, 96822, USA.
Chemistry. 2021 Mar 12;27(15):4939-4945. doi: 10.1002/chem.202004863. Epub 2021 Feb 16.
The identification of silicon-substituted, complex organics carrying multiple functional groups by classical infrared spectroscopy is challenging because the group frequencies of functional groups often overlap. Photoionization (PI) reflectron time-of-fight mass spectrometry (ReTOF-MS) in combination with temperature-programmed desorption (TPD) holds certain advantages because molecules are identified after sublimation from the matrix into in the gas phase based on distinct ionization energies and sublimation temperatures. In this study, we reveal the detection of 1-silaglycolaldehyde (HSiOCH OH), 2-sila-acetic acid (H SiCOOH), and 1,2-disila-acetaldehyde (H SiSiHO)-the silicon analogues of the well-known glycolaldehyde (HCOCH OH), acetic acid (H CCOOH), and acetaldehyde (H CCHO), in the gas phase after preparation in silane (SiH )-carbon dioxide ices exposed to energetic electrons and subliming the neutral reaction products formed within the ices into the gas phase.
通过经典的红外光谱法鉴定含有多个官能团的硅取代复杂有机物具有挑战性，因为官能团的基团频率经常重叠。光电离（PI）反射飞行时间质谱（ReTOF-MS）与程序升温解吸（TPD）相结合具有一定的优势，因为分子是在从基质升华到气相中后根据不同的电离能和升华温度进行鉴定的。在这项研究中，我们揭示了气相中硅代乙二醛（HSiOCHOH）、硅代乙酸（H SiCOOH）和 1,2-二硅代乙醛（H SiSiHO）的检测，它们是乙二醛（HCOCHOH）、乙酸（H CCOOH）和乙醛（H CCHO）的硅类似物，这些产物是在硅烷（SiH ）-二氧化碳冰中制备的，这些冰暴露于高能电子中，并将在冰内形成的中性反应产物升华到气相中。
