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
期刊:
影响因子:
--
通讯作者:
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
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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DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
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影响因子:
2.3
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DOI:
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发表时间:
2019
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DOI:
--
发表时间:
1988
期刊:
影响因子:
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作者:
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通讯作者:
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