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EPR equilibration study of the O-H bond dissociation enthalpy in a benzyl phenolic antioxidant

机译:苄基酚类抗氧化剂中O-H键离解焓的EPR平衡研究

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The equilibrium of the reaction galvinoxyl radical + 4,4'-methylene-bis(2,6-di-tert-butyl-phenol) (IOH) reversible arrow hydrogalvinoxyl + 4,4'-methylene-bis(2,6-di-tert-butyl-phenoxyl radical) was monitored by electron paramagnetic resonance spectroscopy between 213 and 293 K. The equilibrium constant was calculated for each temperature point and correlated to T-1 applying the Van't Hoff relationship lnK(R) = (Delta H-R(0)/RT) + (Delta S-R(0)/R). The reaction enthalpy was found to be 12.0 +/- 0.9 kJ/mol and the bond strength in IOH (BDE(O (H))) = 340.7 +/- 3.0 kJ/mol. The thermochemical stabilization of the involved phenoxyls is discussed.
机译:反应的平衡galvinoxyl自由基+ 4,4'-亚甲基-双(2,6-二叔丁基苯酚)(IOH)可逆箭头加氢氧基乙烯基+ 4,4'-亚甲基-双(2,6-di -叔丁基-苯氧基自由基)通过电子顺磁共振波谱在213和293 K之间进行监测。计算每个温度点的平衡常数,并使用Van't Hoff关系lnK(R)=(Delta HR(0)/ RT)+(Delta SR(0)/ R)。发现反应焓为12.0 +/- 0.9kJ / mol,在IOH中的结合强度(BDE(O(H)))= 340.7 +/- 3.0kJ / mol。讨论了所涉及的苯氧基的热化学稳定性。

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