Pentadiynylidene and Its Methyl-Substituted Derivates: Threshold Photoelectron Spectroscopy of R<sub>1</sub>-C<sub>5</sub>-R<sub>2</sub> Triplet Carbon Chains
作者:Engelbert Reusch、Dustin Kaiser、Domenik Schleier、Rachel Buschmann、Anke Krueger、Thomas Hermann、Bernd Engels、Ingo Fischer、Patrick Hemberger
DOI:10.1021/acs.jpca.8b12244
日期:2019.3.14
the experiments. For the unsubstituted pentadiynylidene (R1 = R2 = H) the recorded spectrum yields an adiabatic ionization energy (IEad) of 8.36 ± 0.03 eV. In addition, a second carbene isomer, 3-(didehydrovinylidene)cyclopropene, with a singlet electronic ground state, was identified in the spectrum based on the IEad of 8.60 ± 0.03 eV and Franck–Condon simulations. We found that multireference computations
气相中的质量选择阈值光电子能谱用于表征二炔基三重态碳戊二烯戊二炔(HC 5 H),甲基戊二炔(MeC 5 H)和二甲基戊二炔(MeC 5 Me)。重氮化合物被用作前体通过闪速热解生成羧甲基。在光电子光子重合(PEPICO)实验中,通过真空紫外(VUV)同步辐射将R 1 -C 5 -R 2碳链光电离。进行了从头算起的高级计算,以支持对实验的解释。对于未取代的戊二炔(R 1 = R 2= H)记录的光谱产生的绝热电离能(IE ad)为8.36±0.03 eV。此外,根据8.60±0.03 eV的IE ad和Franck-Condon模拟,在光谱中鉴定出第二个卡宾异构体3-(二氢亚乙烯基)环丙烯,具有单重电子基态。我们发现需要多参考计算才能可靠地计算该分子的IE广告。CASPT2计算可预测IE广告= 8.55 eV,而耦合群集计算大大高估了IE。环状异构体很可能由样品中存在的前体的另一种异构体形