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An unusual intermolecular interaction between a lone pair and an electron-rich π-electron system of a quinoid dianion
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2021-09-23 , DOI: 10.1021/acs.cgd.1c00492
Vedran Vuković 1 , Tomislav Piteša 2 , Christian Jelsch 1 , Emmanuel Wenger 1 , Krešimir Molčanov 2
Affiliation  

The crystal structure of lithium 2,5-dihydroxyquinonate dihydrate bis(dimethyl sulfoxide) solvate (Li2DHQ(H2O)2(DMSO)2) reveals a close contact between the lone pair on the electropositive S atom of DMSO and the dianionic quinoid ring. This contact, resembling a π-hole interaction involving a dianion as an acceptor, was studied in detail by a combination of X-ray charge density and quantum chemical modeling. The topology of electron density reveals a bond path and a (3, −1) critical point between the S atom of the DMSO and a C atom of the quinoid ring, while an analysis of the electrostatic potential indicates that the interaction between these two atoms is repulsive. However, the global electrostatic interaction between the DMSO and the dihydroxyquinonate moieties is attractive (−19.1 kJ/mol), as well as the total in vacuo interaction energy (−42.8 kJ/mol).

中文翻译:

孤对电子与醌型二价阴离子的富电子 π 电子系统之间不寻常的分子间相互作用

2,5-二羟基醌酸锂二水合物双(二甲亚砜)溶剂化物(Li 2 DHQ(H 2 O) 2 (DMSO) 2的晶体结构)) 揭示了 DMSO 带正电性 S 原子上的孤对电子与二阴离子醌环之间的紧密接触。这种接触类似于包含二价阴离子作为受体的 π 空穴相互作用,通过 X 射线电荷密度和量子化学模型的组合进行了详细研究。电子密度的拓扑结构揭示了 DMSO 的 S 原子和醌型环的 C 原子之间的键路径和 (3, -1) 临界点,而静电势分析表明这两个原子之间的相互作用令人厌恶。然而,DMSO 和二羟基醌酸酯部分之间的全局静电相互作用是有吸引力的(-19.1 kJ/mol),以及总的真空相互作用能(-42.8 kJ/mol)。
更新日期:2021-10-06
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