首页> 外文期刊>RSC Advances >[2.2.2]Paracyclophane, preference for eta(6) or eta(18) coordination mode including Ag(I) and Sn(II): a survey into the cation-pi interaction nature through relativistic DFT calculations
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[2.2.2]Paracyclophane, preference for eta(6) or eta(18) coordination mode including Ag(I) and Sn(II): a survey into the cation-pi interaction nature through relativistic DFT calculations

机译:[2.2.2] Paracyclophane,偏好eta(6)或eta(18)包括Ag(I)和Sn(II)的配位模式:通过相对论DFT计算对阳离子-pi相互作用性质的调查

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摘要

[2.2.2] Paracyclophane is a versatile pi-cryptating structure, which can exhibit eta(2):eta(2):eta(2) and eta(6):eta(6):eta(6) coordination with metal ions, involving two or six carbon atoms in each aromatic ring. According to the nature of the metallic cation, the interaction can occur at the centre of the cage or upper face of the structure, which is determined mainly by the ligand-to-metal charge transfer ruled by symmetry and energetic considerations, and thus by the nature of the cation-pi interaction. For Ag(I), the 5s-Ag shell is close in energy to the frontier orbitals of paracyclophane, resulting in the formation of a bonding combination with the symmetric combination of the pi(2)-type levels, which leads to a non-centered conformation. In contrast, the Sn(II) case exhibits a largely favourable bonding interaction with the pi(2) and pi(3) type levels, which involve the 5p-Sn shell and result in a centered conformation. The interaction between the metal and paracyclophane was studied via molecular orbitals diagram, energy decomposition analyses (EDA) and non-covalent indexes (NCI).
机译:[2.2.2]对环星是一种通用的pi加密结构,可以显示与金属离子配位的eta(2):eta(2):eta(2)和eta(6):eta(6):eta(6)在每个芳环中包含两个或六个碳原子。根据金属阳离子的性质,相互作用可以发生在笼子的中心或结构的上表面,这主要由对称性和高能因素决定的配体到金属的电荷转移决定,因此pi相互作用的性质。对于Ag(I),5s-Ag壳的能量接近对环烷的前沿轨道,导致与pi(2)型能级的对称组合形成键结合,从而导致非-中心构象。相反,Sn(II)情况与pi(2)和pi(3)类型的位点表现出非常有利的键相互作用,其中涉及5p-Sn壳并导致居中构象。通过分子轨道图,能量分解分析(EDA)和非共价指数(NCI)研究了金属与对环烷之间的相互作用。

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