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Experimental and computational evidence for a stabilising C–Cl(lone-pair)⋯π(chelate-ring) interaction
CrystEngComm ( IF 2.6 ) Pub Date : 2020-11-02 , DOI: 10.1039/d0ce01478h
Sang Loon Tan 1, 2, 3, 4, 5 , See Mun Lee 1, 2, 3, 4, 5 , Kong Mun Lo 1, 2, 3, 4, 5 , A. Otero-de-la-Roza 6, 7, 8, 9, 10 , Edward R. T. Tiekink 1, 2, 3, 4, 5
Affiliation  

In addition to a variety of conventional non-covalent intermolecular interactions such as C–H⋯π (arene), C–H⋯Cl and π(arene)⋯π(chelate-ring) contacts, the molecular packing in the crystal of an organotin dithiocarbamate compound, [SnCl(4-ClC6H4)2{S2CN(i-Pr)2}], exhibits evidence for a C–Cl⋯π(chelate-ring) interaction. These interactions occur via a side-on approach of the chloride atom to the chelate-ring and therefore are characterised as C–Cl(lone-pair)⋯π(chelate-ring) interactions, are shown to be attractive by NCI plots and QTAIM analysis, and are apparent in the calculated Hirshfeld surfaces. Theory suggests the energy of association provided by the C–Cl⋯π(chelate-ring) interactions to be about 3–4 kcal mol−1, a value greater than for analogous C–Cl⋯π(arene) and C–H⋯π(arene) interactions. A survey of the literature for related structures suggests that these interactions are not common. The newly described C–Cl(lone-pair)⋯π(chelate-ring) interactions add to the variety of intermolecular interactions able to be formed by chelate-rings in the supramolecular chemistry of metal complexes.

中文翻译:

稳定的C–Cl(孤对)⋯π(螯合物-环)相互作用的实验和计算证据

除了各种常规的非共价分子间相互作用,例如C–H⋯π(芳烃),C–H⋯Cl和π(芳烃)⋯π(螯合环)接触外,有机锡二硫代氨基甲酸酯化合物[SnCl(4-ClC 6 H 42 {S 2 CN(i-Pr)2 }]显示C–Cl⋯π(螯合物-环)相互作用的证据。这些相互作用通过NCI图和QTAIM分析表明,氯原子与螯合物环的并列反应方式为C–Cl(孤对)⋯π(螯合物-环)相互作用,被证明具有吸引力。在计算的Hirshfeld曲面中可见。理论表明,由C–Cl⋯π(螯合物-环)相互作用提供的缔合能约为3-4 kcal mol -1,该值大于类似的C–Cl⋯π(芳烃)和C–H⋯ π(芳烃)相互作用。对相关结构文献的调查表明,这些相互作用并不常见。新近描述的C–Cl(孤对)⋯π(螯合环)相互作用增加了金属络合物超分子化学中的螯合环形成的各种分子间相互作用。
更新日期:2020-11-21
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