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首页> 外文期刊>Chemical Physics Letters >Theoretical enthalpies of formation and C-H bond dissociation enthalpies of n-bromopropane and its free radicals
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Theoretical enthalpies of formation and C-H bond dissociation enthalpies of n-bromopropane and its free radicals

机译:正溴丙烷及其自由基的理论生成焓和C-H键解离焓

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摘要

The enthalpies of formation of n-bromopropane (CH3CH2CH2Br) and its free radicals (CH2CH2CH2Br, CH3CHCH2Br and CH3CH2CHBr) were estimated by molecular orbital integrated methods using several working chemical reactions with four variants of theoretical approaches (levels) and four extended basis sets. The recommended standard enthalpies of formation are: CH3CH2CHBr, -19.5 +/- 0.6 kcal mol(-1), in excellent agreement with the only experimental datum available; CH2CH2CH2Br, 28.7 +/- 0.3; CH3CHCH2Br, 23.1 +/- 1.4; and CH3CH2CHBr, 25.7 +/- 0.6 kcal mol(-1). These enthalpies of formation correspond to bond dissociation enthalpies of DH2980(H-CH2CH2 CH2Br) = 101.6 +/- 1.0; DH2980,(CH3CH-HCH2Br) = 96.0 +/- 2.1; and DH2980(CH3CH2CHBr-H) = 98.6 +/- 1.2 kcal mol(-1). (C) 2003 Published by Elsevier B.V. [References: 29]
机译:通过分子轨道积分方法,使用几种工作化学反应,采用理论方法的四个变体(水平)和四个扩展的基础集,通过分子轨道积分法估算了正溴丙烷(CH3CH2CH2Br)及其自由基(CH2CH2CH2Br,CH3CHCH2Br和CH3CH2CHBr)的形成焓。推荐的标准生成焓为:CH3CH2CHBr,-19.5 +/- 0.6 kcal mol(-1),与唯一可用的实验数据高度吻合; CH 2 CH 2 CH 2 Br,28.7 +/- 0.3; CH 3 CHCH 2 Br,23.1 +/- 1.4;和CH3CH2CHBr,25.7 +/- 0.6 kcal mol(-1)。这些形成焓对应于DH2980(H-CH2CH2 CH2Br)的键解离焓= 101.6 +/- 1.0; DH2980,(CH 3 CH-HCH 2 Br)= 96.0 +/- 2.1;和DH2980(CH3CH2CHBr-H)= 98.6 +/- 1.2 kcal mol(-1)。 (C)2003年由Elsevier B.V.出版[参考文献:29]

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