Photochemical Kinetics of a Phosphine Oxide Free Radical Initiator from Femtosecond UV-Pump/Mid-IR-Probe Spectroscopy.
Photochemical Kinetics of a Phosphine Oxide Free Radical Initiator from Femtosecond UV-Pump/Mid-IR-Probe Spectroscopy.
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飞秒紫外泵/中红外探针光谱法研究氧化膦自由基引发剂的光化学动力学
DOI:
10.1021/acs.jpca.7b04268
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
P. Vöhringer
中科院分区:
文献类型:
--
作者:
S. Straub;J. Lindner;P. Vöhringer
Femtosecond UV-pump/mid-infrared-probe spectroscopy was used to explore in detail the primary photochemical events of the free radical initiator, (2,4,6-trimethylbenzoyl)diphenylphosphine oxide, in liquid dichloromethane solution at room temperature. Following electronic excitation of its lowest excited singlet state, S1, the radical initiator undergoes an intersystem crossing to the triplet ground state, T1, with a time constant of 135 ps. A subsequent α-cleavage occurs from the triplet state with a time constant of 15 ps and yields a trimethylbenzoyl radical together with a diphenylphosphinoyl radical. Transient absorptions from the S1and T1states are observed that can be assigned to the PO stretching mode and the symmetric in-plane deformation mode of the trimethylphenyl moiety of the radical initiator.
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DOI:
10.1007/978-94-011-1876-7
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1993
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1972
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