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Isomerism and Biradical Character of Tetrapnictide Dianions: A Computational Study
European Journal of Inorganic Chemistry ( IF 2.2 ) Pub Date : 2020-09-14 , DOI: 10.1002/ejic.202000422
Peter Coburger 1, 2 , Robert Wolf 1 , Hansjörg Grützmacher 2
Affiliation  

We present a computational study on tetrapnictide dianions Pn 4 2– (Pn = P, As, Sb, Bi), using density functional theory (DFT), coupled‐cluster [DLPNO‐CCSD(T)] and complete active space self‐consistent field (CASSCF) methods. Environmental effects such as solvation and coordination of counterions are included. The calculations reveal that out of three isomers (square‐planar, butterfly and capped‐triangle), the square planar isomers are generally the most stable. The counterion (Li+ and Mg2+) used in the calculations have a substantial effect on the relative stabilities. The square planar isomers show considerable biradical character. Calculated reactions toward alkenes indicate that this unusual electronic structure has significant implications on the reactivity of the Pn 4 2– dianions.

中文翻译:

四肽二价阴离子的异构和双自由基特征:一项计算研究

我们使用密度泛函理论 (DFT)、耦合簇 [DLPNO-CCSD(T)] 和完全活性空间自洽,对四肽二价阴离子 Pn 4 2– (Pn = P, As, Sb, Bi) 进行了计算研究场 (CASSCF) 方法。包括环境影响,例如反离子的溶剂化和配位。计算表明,在三种异构体(方形平面、蝶形和带帽三角形)中,方形平面异构体通常是最稳定的。计算中使用的反离子(Li+ 和 Mg2+)对相对稳定性有很大影响。方形平面异构体显示出相当大的双自由基特征。对烯烃的计算反应表明,这种不寻常的电子结构对 Pn 4 2- 二价阴离子的反应性具有重要意义。
更新日期:2020-09-14
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