3-Furaldehyde (3FA) was isolated in an argon matrix at 12 K and studied using FTIR spectroscopy and quantum chemistry. The molecule has two conformers, with trans and cis orientation of the O═C—C═C dihedral angle. At the B3LYP/6-311++G(d,p) level of theory, the trans form was computed to be ca. 4 kJ mol−1 more stable than the cis form. The relative stability of the two conformers was explained using
在12 K的
氩气基质中分离出3-
甲醛(3FA),并使用FTIR光谱和量子
化学进行了研究。该分子具有两个构象异构体,具有O═C-CorientationC二面角的反式和顺式取向。在B3LYP / 6-311 ++ G(d,p)的理论
水平上,转换形式的计算结果约为ca。4 kJ mol -1比顺式稳定。使用自然键轨道(NBO)方法解释了两个构象体的相对稳定性。与其计算出的相对能量和较高的旋转势垒(约34 kJ mol -1)完全吻合(从反式到顺式),反式和顺式构象异构体以约7:1的比例从复合室温气相捕获在
氩气基质中。实验观察到的两种形式的振动信号与理论计算的光谱非常吻合。