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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Kinetics and Thermochemistry of the Hydroxycyclohexadienyl Radical Reaction with O_2: C_6H_6OH + O_2 - - C_6H_6(OH)OO
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Kinetics and Thermochemistry of the Hydroxycyclohexadienyl Radical Reaction with O_2: C_6H_6OH + O_2 - - C_6H_6(OH)OO

机译:O_2:C_6H_6OH + O_2-> <-C_6H_6(OH)OO的羟基环己二烯基自由基反应的动力学和热化学

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The UV absorption spectrum along with the self-reaction and oxidation reaction kinetics of the hydroxycyclohexadienyl radical, C_6H_6OH (which results from OH addition to benzene), were studied using excimer laser photolysis coupled to transient UV absorption. The radicals were generated by photolysis of N_2O/H_2O/C_6H_6/He mixtures at 193 nm in a series of chemical reactions initiated by O(1D). The radical has continuous absorption in the range 260-340 nm with a maximum absorption cross-section of (8.1 ± 1.4) * 10~(-18) cm~2 molecule~(-1) at 280 nm. Reaction of the radical with molecular oxygen, C_6H_6OH + O_2 C6H6(OH)OO (1), and self-reaction C6H6OH + C_6H_6OH products (2), were studied over the 252-285 K temperature range at 1.01 ± 0.02 bar (He). The radical temporal profiles were recorded via transient absorption at 315 nm. In reaction 1, two-time-domain "equilibration" kinetics were recorded in the temperature range 252-273 K. The rate constant of the addition reaction is k1 = (1.4 ± 0.8) * 10~(-12) exp(-18.6 ± 1.7 kJ mol~(-1)/RT) cm~3 molecule~(-1) s~(-1). The standard enthalpy of reaction 1 was determined from the measured equilibrium constants using the third law method: = -43.6 ± 2.0 kJ mol~(-1). The measured rate constant of self-reaction 2 is k~2 = (6 ± 3) * 10~(-11) exp(-2.00 ± 1.6 kJ mol~(-1)/RT) cm~3 molecule~(-1) s~(-1).
机译:使用准分子激光光解与瞬态UV吸收耦合,研究了羟基环己二烯基C_6H_6OH(由向苯中添加OH产生)的紫外吸收光谱以及自反应和氧化反应动力学。自由基是通过O(1D)引发的一系列化学反应在193 nm处对N_2O / H_2O / C_6H_6 / He混合物进行光解而产生的。自由基在260-340 nm范围内具有连续吸收,在280 nm处的最大吸收截面为(8.1±1.4)* 10〜(-18)cm〜2分子〜(-1)。在1.01±0.02 bar(He)的252-285 K温度范围内研究了自由基与分子氧C_6H_6OH + O_2 C6H6(OH)OO(1)和自反应C6H6OH + C_6H_6OH产物(2)的反应。通过在315nm处的瞬时吸收来记录自由基的时间分布。在反应1中,在252-273 K的温度范围内记录了两个时域的“平衡”动力学。加成反应的速率常数为k1 =(1.4±0.8)* 10〜(-12)exp(-18.6) ±1.7 kJ mol〜(-1)/ RT)cm〜3分子〜(-1)s〜(-1)。使用第三定律方法,由测得的平衡常数确定反应1的标准焓:-43.6±2.0 kJ mol〜(-1)。测得的自反应2的速率常数为k〜2 =(6±3)* 10〜(-11)exp(-2.00±1.6 kJ mol〜(-1)/ RT)cm〜3分子〜(-1 )s〜(-1)。

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