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Bonding Analysis of Compounds with Unusual Coordination of Carbon: Proposed Symmetric Systems with Six-Coordinate Carbon

机译:具有异常协调碳的化合物的粘合分析:具有六坐标碳的提出对称系统

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摘要

The possibility of carbon tetravalence in geometries other than tetrahedral and of carbon hypervalence has been taken seriously since the 1970s. Computational modeling and subsequent experimental validation have established the existence of molecules with carbon atoms with planar tetravalence and as many as six objects in carbon’s coordination sphere. In this work, we develop insight into the nature of bonding to carbon in these unusual environs as provided by Bader’s Atoms in Molecules (AIM) analysis of the electron density, along with the electron localization function (ELF) and the non-covalent index (NCI). We review several well-established systems (spiropentadiene dication, hexamethyl benzene dication, dimethanospiro[2.2]octaplane dication, and 1,8-dimethoxy-9-dimethoxyanthracene cation) and propose new D2d–symmetric variants of a hexacoordinated species.
机译:自20世纪70年代以来,自1970年代以来一直在严重采取了四面体和碳嗜睡以外的几何形状中碳四价碳的可能性。计算建模和随后的实验验证已经建立了具有平面间距的碳原子的分子存在,并且在碳的协调球中多达六个物体。在这项工作中,我们在这些不寻常的环境中介绍了在这些不寻常的环境中粘接到碳的性质,如獾的原子在电子密度分析的分子(AIM)分析中,以及电子定位功能(ELF)和非共价指数( nci)。我们审查了几种完整的系统(螺旋黄素二烯,六甲基苯二滴,二甲基硼罗[2.2]八氯烷二烷基),以及1,8-二甲氧基-9-二甲氧基蒽阳离子,并提出新的六环化物种的D2D对称变体。

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