Kolesniková Lucie, León Iker, Alonso Elena R, Mata Santiago, Alonso Jose L
Grupo de Espectroscopia Molecular (GEM), Unidad Asociada CSIC, Laboratorios de Espectroscopia y Bioespectroscopia, Edificio Quifima , Universidad de Valladolid , 47011 Valladolid , Spain.
J Phys Chem Lett. 2019 Mar 21;10(6):1325-1330. doi: 10.1021/acs.jpclett.9b00208. Epub 2019 Mar 7.
In the course of the investigation of the rotational spectrum of prebiotic hydantoic acid by Fourier transform microwave spectroscopy coupled to a laser ablation source in a supersonic expansion, rotational signatures of two cyclic molecules, hydantoin and 2,5-oxazolidinedione, have been unexpectedly observed along with the four most stable conformers of hydantoic acid. Interestingly, two of them presented folded geometric arrangements that might act as precursors in the cyclization reactions assisted by laser ablation. They could play the role of near-attack conformations (NACs) in the framework of the NAC theory for intramolecular reactions. A detailed analysis of the spectrum further revealed the simultaneous formation of other species in the jet, showing that the laser ablation of solid organic precursors constitutes an alternative tool in the generation of new chemical species.
在对益生元乙内酰脲酸的转动光谱进行研究的过程中，通过傅里叶变换微波光谱法与超音速膨胀中的激光烧蚀源相结合，意外地观察到了两种环状分子（乙内酰脲和2,5-恶唑烷二酮）的转动特征以及乙内酰脲酸的四种最稳定构象。有趣的是，其中两种呈现出折叠的几何排列，可能在激光烧蚀辅助的环化反应中充当前体。在分子内反应的近攻构象（NAC）理论框架下，它们可能起到近攻构象的作用。对光谱的详细分析进一步揭示了射流中同时形成的其他物种，表明固体有机前体的激光烧蚀是产生新化学物种的一种替代工具。
