首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >An ab Initio Study of the [C_2H_5O~-] Potential Energy Surface and the Fragmentation Pathways of the Ethoxide Anion
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An ab Initio Study of the [C_2H_5O~-] Potential Energy Surface and the Fragmentation Pathways of the Ethoxide Anion

机译:[C_2H_5O〜-]势能面和乙醇根阴离子的裂解途径的从头算研究

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摘要

The [C_2H_5O~-] potential energy surface has been investigated with a modified Gaussian-2 methodology, the G2 ++ approximation. Eight stable [C_2H_5O~-] isomers have been found on the surface: CH_3CH_2O~- (1~-), W-CH_3CHOH~- (2~-), Y-CH_3CHOH~- (3~-), Y-CH_2OCH_3~- (4~-), W-CH_2OCH_3~- (5~-), ZE-CH_2CH_2OH~- (6~-), EE-CH_2CH_2OH~- (7~-), and EZ-CH_2CH_2OH~- (8~-). Among these isomers, 1~- is the most stable thermo-dynamically. The calculated G2++ heats of formation for the isomeric anions are in very good accord with the available experimental data. Also studied with the same ab initio method are the various rearrangements among the eight isomers and the fragmentation pathways of 1~-. Among the reactions involving 1~-, the fragmentation process 1~- -> H_2 + CH_2CHO~- has the least barrier. This result is in total agreement with the experimental collision activated dissociation and infrared multiple photon induced elimination studies of the ethoxide anion.
机译:[C_2H_5O〜-]势能面已使用改进的高斯2方法(G2 ++近似)进行了研究。在表面上发现了8个稳定的[C_2H_5O〜-]异构体:CH_3CH_2O〜-(1〜-),W-CH_3CHOH〜-(2〜-),Y-CH_3CHOH〜-(3〜-),Y-CH_2OCH_3〜 -(4〜-),W-CH_2OCH_3〜-(5〜-),ZE-CH_2CH_2OH〜-(6〜-),EE-CH_2CH_2OH〜-(7〜-)和EZ-CH_2CH_2OH〜-(8〜- )。在这些异构体中,1〜-是热力学上最稳定的。计算得出的异构体阴离子的G2 ++生成热与现有实验数据非常吻合。还使用相同的从头算方法研究了8个异构体之间的各种重排以及1〜-的断裂途径。在涉及1〜-的反应中,裂解过程1〜-> H_2 + CH_2CHO〜-具有最小的阻隔作用。该结果与乙醇碰撞阴离子的实验碰撞活化解离和红外多光子诱导的消除研究完全一致。

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