封面特写：俘获效应的起源：孤对屏蔽自由基（ChemistryEurope1/2023）

ChemistryEurope Pub Date : 2023-06-23 DOI:10.1002/ceur.202300038

Eva Blokker, Martijn ten Brink, Dr. J. Martijn van der Schuur, Dr. Trevor A. Hamlin, Prof. Dr. F. Matthias Bickelhaupt

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摘要

自由基屏蔽削弱了适当取代的甲基自由基之间的C−C电子对键。F。 Matthias Bickelhaupt及其同事介绍了“孤对屏蔽自由基”（LPSR）的新概念，其中自由基电子轨道被一个孤对状轨道包围或屏蔽。后者在C−C键形成时引起闭壳层（泡利）排斥，从而降低二聚体的稳定性。Daniela Rodrigues Silva设计。在右边，电子对键是不受阻碍的。

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Cover Feature: Origin of the Captodative Effect: The Lone-Pair Shielded Radical (ChemistryEurope 1/2023)

Radical shielding weakens the C−C electron-pair bond between appropriately substituted methyl radicals. In their Research Article, F. Matthias Bickelhaupt and co-workers introduce the novel concept of the “Lone-Pair Shielded Radical“ (LPSR), in which the radical-electron orbital is surrounded, or shielded, by a lone-pair-like orbital. The latter causes closed-shell (Pauli) repulsion upon C−C bond formation, and thus reduces the stability of the dimer. This is shown on the left side of the cover illustration Dr. Daniela Rodrigues Silva designed. On the right side, the electron-pair bond is unhindered.

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ChemistryEurope

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