Shock wave and modelling study of the dissociation pathways of (C2F5)3N.

Shock wave and modelling study of the dissociation pathways of (C2F5)3N.
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(C2F5)3N解离途径的冲击波和模型研究

DOI:
10.1039/c9cp01142k
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发表时间:
2019
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
J. Troe
J. Troe
中科院分区:
--
文献类型:
--
作者:
C. J. Cobos;K. Hintzer;L. Sölter;E. Tellbach;A. Thaler;J. Troe

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通过监测CF2的生成,研究了全氟三乙胺(C2 F5)3 N)在冲击波中的热分解。实验是在1120-1450 K的温度范围内进行的,反应物浓度在100和1000 ppm之间的(C2 F5)3 N在浴气Ar中,[Ar]在(0.7-5.5)× 10−5 mol cm−3的范围内。这些实验伴随着各种解离路径能量的量子化学计算和速率计算,特别是C2 F5通过C2 F5 → CF 3 + CF2的解离。整个反应可以以不同的方式进行,或者通过一系列连续的C-N键断裂,然后快速C2 F5分解,或者通过一系列交替的C-C和C-N键断裂。也可以在两条路径之间进行交叉。在低于约1300 K的温度下,观察到每(C2 F5)3 N分解小于一个CF2的产率。另一方面,在2000 K左右的温度下,当除了母体分子之外,CF 3也解离时,测量到每分解(C2 F5)3 N产生6个CF 2。在中温下的解离速率延迟步骤为(C_2F_5)NCF_2 →(C_2F_5)N + CF_2和(CF_2)N → N + CF_2。低温下CF2产率的降低暂时归因于在(C2 F5)2NCF 2水平上的机理分支,由此形成环状最终产物全氟-N-甲基吡咯烷((C4 F8)NCF 3),这在来自文献的早期工作中被鉴定。
The thermal decomposition of perfluorotriethylamine, (C2F5)3N, was investigated in shock waves by monitoring the formation of CF2. Experiments were performed over the temperature range of 1120–1450 K with reactant concentrations between 100 and 1000 ppm of (C2F5)3N in the bath gas Ar and with [Ar] in the range of (0.7–5.5) × 10−5 mol cm−3. The experiments were accompanied by quantum-chemical calculations of the energies of various dissociation paths and by rate calculations, in particular for the dissociation of C2F5via C2F5 → CF3 + CF2. The overall reaction can proceed in different ways, either by a sequence of successive C–N bond ruptures followed by fast C2F5 decompositions, or by a sequence of alternating C–C and C–N bond ruptures. A cross-over between the two pathways can also take place. At temperatures below about 1300 K, yields of less than one CF2 per (C2F5)3N decomposed were observed. On the other hand, at temperatures around 2000 K, when besides the parent molecule, CF3 also dissociates, yields of six CF2 per (C2F5)3N decomposed were measured. The rate-delaying steps of the dissociation mechanism at intermediate temperatures were suggested to be the processes (C2F5)NCF2 → (C2F5)N + CF2 and (CF2)N → N + CF2. The reduction of the CF2 yields at low temperatures was tentatively attributed to a branching of the mechanism at the level of (C2F5)2NCF2, from where the cyclic final product perfluoro-N-methylpyrrolidine, (C4F8)NCF3, is formed which was identified in earlier work from the literature.
气态和固态三(2,2,2-三氟乙基)胺 N(CH2CF3)3 的结构和构象
DOI: --
发表时间: 1994
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DOI: 10.1021/acs.jpca.7b05859
发表时间: 2017
期刊: The journal of physical chemistry. A
影响因子: --
作者:
C. Cobos;G. Knight;L. Sölter;E. Tellbach;J. Troe
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DOI: 10.1039/c7cp07098e
发表时间: 2018
期刊: Physical chemistry chemical physics : PCCP
影响因子: --
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C. J. Cobos;G. Knight;L. Sölter;E. Tellbach;J. Troe
通讯作者: J. Troe