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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Elusive Cyanoform: Computational Probing Its Stability and Reactivity with Accurate Ab Initio Methods
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Elusive Cyanoform: Computational Probing Its Stability and Reactivity with Accurate Ab Initio Methods

机译:难以捉摸的花生素:用准确的AB Initio方法计算其稳定性和反应性

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We have applied the CCSD(T)-F12a/cc-pVTZ-F12//CCSD(T)/cc-pVTZ level of theory to calculate energies for 22 reactions pertinent to the stability and reactivity of hardly isolable cyanoform (HC(CN)(3)). A number of exothermic processes has been indicated, especially the hydration. In the predicted mechanism for the gas-phase hydration of cyanoform, the H2O addition to the C.N bond corresponds to a rate-limiting step, which is aided by an extra molecule of water. Also, for the cyanoform dihydrate (H2NC(OH)C(CN)CONH2) product, the experimentally identified compound, the more stable planar isomer exhibits intramolecular O-H center dot center dot center dot O C (not N-H center dot center dot center dot O.C) H-bonding. Our calculated structures, binding energies, and NBO data for [HC(CN)(3)](n) (n = 2,4) clusters suggest that the nonconventional C-H center dot center dot center dot N H-bonds contribute to their stability. Among the surveyed structures of the C N group incorporating products of reactions examined, the CCSD(T)/cc-pVTZ molecular parameters of cyanocarbons C-2(CN)(4), C-2(CN)(6), and C-6(CN)(6) can be regarded as the most accurate gas-phase values up-to-date.
机译:我们已经应用了CCSD(t)-f12a / cc-pvtz-f12 // ccsd(t)/ cc-pvtz理论水平,以计算与几乎不可分离的树脂疣的稳定性和反应性有关的22个反应的能量(HC(CN) (3))。已经表明了许多放热过程,特别是水合。在CyanOform的气相水合的预测机制中,C.N键的H 2 O对应于速率限制步骤,其由额外的水分子辅助。另外,对于氰化物二水合物(H2NC(OH)C(CN)ConH2)产物,实验鉴定的化合物,更稳定的平面异构体呈现分子内OH中心DOT中心点中心点OC(不是NH中心点中心点中心点OC) H键合。我们计算的结构,绑定能量和[HC(CN)(3)](n)(n)(n = 2,4)集群表明,非协聚CH中心DOT中心点中心点N H-BONDES有助于它们的稳定性。 CN组的调查结构掺入反应的产物,CCSD(T)/ CC-PVTZ分子参数C-2(CN)(4),C-2(CN)(6),以及C- 6(CN)(6)可以被视为最准确的气相值最新。

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