Electronic Structure and Excited-State Dynamics of an Arduengo-Type Carbene and its Imidazolone Oxidation Product.

Electronic Structure and Excited-State Dynamics of an Arduengo-Type Carbene and its Imidazolone Oxidation Product.
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Arduengo型卡宾及其咪唑酮氧化产物的电子结构和激发态动力学

DOI:
10.1002/chem.201605027
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发表时间:
2017
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影响因子:
--
通讯作者:
I. Fischer
I. Fischer
中科院分区:
--
文献类型:
--
作者:
H.-C. Schmitt;M. Flock;E. Welz;B. Engels;H. Schneider;U. Radius;I. Fischer

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我们描述了一个孤立的1,3-二叔丁基咪唑啉-2-亚基(tBu 2 Im,C11 H20 N2,m/z=180),一个Arduengo型卡宾的激发态动力学的研究,通过时间和频率分辨的光电离使用皮秒激光系统。用含时密度泛函理论(TD-DFT)计算了几种单重态和三重态激发态的能量。卡宾的S1态在100 ps的时间尺度上可能通过系间穿越而失活。 在实验中,我们观察到一个额外的信号atm/z=196,该信号归属于氧化产物1,3-二叔丁基咪唑酮tBu 2 ImO。它显示了一个分辨率很好的共振增强多光子电离(REMPI)光谱,原点位于36951 cm−1。 可以分配几个低振动带,其寿命强烈依赖于激发能。在原点,寿命长于3 ns,但在更高的过剩能量下下降到49 ps。  为了确认咪唑酮的形成,我们还对苯并咪唑酮(BzImO)进行了实验以进行比较。除了BzImO的红移之外,这两种化合物的光谱非常相似。TD-DFT值与实验数据非常吻合。
We describe an investigation of the excited‐state dynamics of isolated 1,3‐di‐tert‐butyl‐imidazoline‐2‐ylidene (tBu2Im, C11H20N2,m/z=180), an Arduengo‐type carbene, by time‐ and frequency‐resolved photoionization using a picosecond laser system. The energies of several singlet and triplet excited states were calculated by time‐dependent density functional theory (TD‐DFT). The S1state of the carbene deactivates on a 100 ps time scale possibly by intersystem crossing. In the experiments we observed an additional signal atm/z=196, that was assigned to the oxidation product 1,3‐di‐tert‐butyl‐imidazolone,tBu2ImO. It shows a well‐resolved resonance‐enhanced multiphoton ionization (REMPI) spectrum with an origin located at 36951 cm−1. Several low‐lying vibrational bands could be assigned, with a lifetime that depends strongly on the excitation energy. At the origin the lifetime is longer than 3 ns, but drops to 49 ps at higher excess energies. To confirm formation of the imidazolone we also performed experiments on benzimidazolone (BzImO) for comparison. Apart from a redshift for BzImO the spectra of the two compounds are very similar. The TD‐DFT values display a very good agreement with the experimental data.
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