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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Enthalpy of Formation of Anisole: Implications for the Controversy on the O-H Bond Dissociation Enthalpy in Phenol
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Enthalpy of Formation of Anisole: Implications for the Controversy on the O-H Bond Dissociation Enthalpy in Phenol

机译:苯甲醚的形成焓:苯酚中O-H键离解焓的争议

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摘要

Significant discrepancies in the literature data for the enthalpy of formation of gaseous anisole, ?fHmo(PhOCH3, g), have fueled an ongoing controversy regarding the most reliable enthalpy of formation of the phenoxy radical and of the gas phase OH bond dissociation enthalpy, DHo(PhOH), in phenol. In the present work triangle H-f(m)o(PhOCH3, g) was reassessed using a combination of calorimetric determinations and high-level (W2-F12) ab initio calculations. Static-bomb combustion calorimetry led to the standard molar enthalpy of formation of liquid anisole at 298.15 K, triangle H-f(m)o(PhOCH3, l) = -(117.1 +/- 1.4) kJmol(-1). The corresponding enthalpy of vaporization was obtained as, triangle H-vap(m)o(PhOCH3) = 46.41 +/- 0.26 kJ mol(-1), by Calvet-drop microcalorimetry. These results give ?fHmo(PhOCH3, g) = -(70.7 +/- 1.4) kJ mol(-1), in excellent agreement with triangle H-f(m)o(PhOCH3, g) = -(70.8 +/- 3.2) kJ mol(-1), obtained from the W2-F12 calculations. The triangle H-f(m)o(PhOCH3, g) here recommended leads to triangle H-f(m)o(PhO, g) = 55.5 +/- 2.4 kJmol1 and DH degrees(PhOH) = 368.1 +/- 2.6 kJmol(-1).
机译:气态苯甲醚的生成焓?fHmo(PhOCH3,g)的文献数据存在显着差异,引发了关于苯氧基自由基和气相OH键解离焓DHo的最可靠生成焓的争论。 (PhOH),以苯酚计。在本工作中,使用量热法测定和高级(W2-F12)从头算的组合重新评估了H-f(m)o(PhOCH3,g)。静态炸弹燃烧量热法得出在298.15 K处形成液体苯甲醚的标准摩尔焓,三角形H-f(m)o(PhOCH3,l)=-(117.1 +/- 1.4)kJmol(-1)。通过Calvet-drop微量量热法获得了相应的汽化焓,为三角形H-vap(m)o(PhOCH3)= 46.41 +/- 0.26 kJ mol(-1)。这些结果给出了?fHmo(PhOCH3,g)=-(70.7 +/- 1.4)kJ mol(-1),与三角形Hf(m)o(PhOCH3,g)=-(70.8 +/- 3.2)非常吻合kJ mol(-1),由W2-F12计算得出。这里推荐的三角形Hf(m)o(PhOCH3,g)导致三角形Hf(m)o(PhO,g)= 55.5 +/- 2.4 kJmol1和DH度(PhOH)= 368.1 +/- 2.6 kJmol(-1 )。

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