首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >XH_4~(2+) Dications and Search for XH_4~(3+) Trications (X = N, P, and As)
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XH_4~(2+) Dications and Search for XH_4~(3+) Trications (X = N, P, and As)

机译:XH_4〜(2+)裁切并搜索XH_4〜(3+)裁切(X = N,P和As)

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摘要

Structures and energies of XH_4~(2+) and XH_4~(3+) (X = N, P, and As) were calculated at the ab initio MP2/6-31G~(**) and QCISD(T)/6-311G~(**) levels of theory. Contrary to previous theoretical studies, the global minimum structure of PH_4~(2+) is not C_(3v) symmetrical 2 but a C_s symmetrical 3 with a 2e-3c bond. The structure 2 is less stable than 3 by 6.5 kcal/mol. Calculations also showed that 2 if formed will spontaneously convert into 3. The planar C_(2v) symmetric structure 6, with a 3c-2e bond, was found to be the only minimum for PH_4~(3+). Similarly, C_s symmetrical 8 and planar C_(2v) symmetric 10, each containing a 2e-3c bond, were found to be the global minima of AsH_4~(2+) and AsH_4~(3+), respectively. Thermodynamics of the deprotonation of the di- and trications studied is also discussed.
机译:从头算出MP2 / 6-31G〜(**)和QCISD(T)/ 6的XH_4〜(2+)和XH_4〜(3+)(X = N,P和As)的结构和能量-311G〜(**)的理论水平。与先前的理论研究相反,PH_4〜(2+)的整体最小结构不是C_(3v)对称2,而是具有2e-3c键的C_s对称3。结构2的稳定性比3差6.5kcal / mol。计算还表明,如果形成2,则会自发转变为3。发现具有3c-2e键的平面C_(2v)对称结构6是PH_4〜(3+)的唯一最小值。类似地,发现每个均具有2e-3c键的C_s对称8和平面C_(2v)对称10分别是AsH_4〜(2+)和AsH_4〜(3+)的全局最小值。还讨论了所研究的二元和三元微粒去质子化的热力学。

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