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Heat Formation of the tert-Butyl Radical

机译:叔丁基自由基的热形成

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摘要

Calculations using a variety of high-level theoretical procedures predict a heat of formation (ΔH°_(f 298)) for the tert-butyl radical of 57 ± 7 kJ mol~(-1), which is slightly higher than recent experimental recommendations (51.5 ± 1,7 and 51.8 250L?1.3 kJ mol~(-1)). The heats of formation for the tert-butyl cation (716 ± kJ mol~(-1)) and isobutene (-14 ± 8 kJ mol~(-1)) predicted by the same theoretical methods are also slightly higher than the experimental values (711.5 ± 0.2 and -16.9 ± 0.9 kJ mol~(-1), respectively), while the proton affinity of isobutene (802 ± 4 kJ mol~(-1)) is in very good agreement with experiment (801. 7 ± 1.4 kJ mol~(-1)). On the other hand, the calculated ionization energy of the tert-butyl radical (6.81 133L?0.06 eV) is significantly higher than two experimental values (6.58 and 6.70 eV), suggesting that a reexamination may be desirable.
机译:使用各种高级理论方法进行的计算预测出,叔丁基自由基的形成热(ΔH°_(f 298))为57±7 kJ mol〜(-1),略高于最近的实验建议(51.5±1.7和51.8×250L≤1.3kJmol·(-1))。用相同的理论方法预测的叔丁基阳离子(716±kJ mol〜(-1))和异丁烯(-14±8 kJ mol〜(-1))的形成热也略高于实验值(分别为711.5±0.2和-16.9±0.9 kJ mol〜(-1)),而异丁烯的质子亲和力(802±4 kJ mol〜(-1))与实验非常吻合(801. 7± 1.4 kJ mol〜(-1))。另一方面,叔丁基自由基的计算电离能(6.816.8133L≤0.06eV)明显高于两个实验值(6.58和6.70eV),表明可能需要重新检查。

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