Conformational Control during the Photolysis of Matrix-Isolated Chloroformylketene: Kinetic and Theoretical Studies of C<sub>3</sub>O<sub>2</sub> Formation
thermolysis of malonyl dichloride CH2(COCl)2 at 50 °C and isolated in rare gas matrices. Both conformers were charaterized by low-temperatureinfrared spectroscopy in argon and xenon matrices. The observed frequencies and intensities are in good agreement with the MP2/D95* ab initio calculations. The experimental spectra show that the s-trans conformer is more stable than the s-cis one. Consistent with
通过在50°C下热解丙二酰二氯CH 2(COCl)2生成氯甲酰基乙烯酮Cl CO CH C O的构象异构体,并在稀有气体基质中进行分离。两种构象物均通过低温红外光谱法在氩气和氙气基质中表征。观察到的频率和强度与MP2 / D95 *从头算起非常吻合。实验光谱表明,s-反式构象体比s-顺式构象体更稳定。与此实验结果一致,高级从头算计算预测这两个构象异构体具有几乎相同的能量。在第一步中,稀有气体基质中的λ≥310 nm处的氯甲酰基乙烯酮的UV辐射显示构象异构体相互转化。在第二个中,s-顺式构象异构体失去HCl生成低碳碳。反应产物(HCl和C 3 O 2)被捕集在同一笼中并形成1:1的络合物,其特征在于其拉伸振动带(在氩气中为2719.5和2232 cm -1)。在基态(S 0)和第一个单重态激发态(S 1)下,使用从头计算在MP2 / 3-21G *级别上进行光化学过程的建模。S 0中的异构化势垒态(12