晨间信号Morning Signal
《科学》 第393卷 第6807期 · 2026年7月9日 · 中文解读

CBi−分子离子中经典三键的相对论性坍缩

Relativistic collapse of the classical triple bond in the CBi− molecular ion · D. Kahraman et al.
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本文通过高分辨率低温光电子能谱和相对论四分量计算,研究了CBi−阴离子中碳-铋三键的电子结构,发现相对论效应导致传统σ+2π三键图像坍缩为纯π-like的|ω|=3/2和两个具有显著σ/π混合的|ω|=1/2 Kramers对。
原文开头
PhYsical cheMistRY Relativistic collapse of the classical triple bond in the CBi− molecular ion Deniz Kahraman1†, Jie Hui1†, Xin-Yu Zhang1, Neil A. Ellis1, Hyun Wook Choi1‡, Kirk A. Peterson2*, Lai-Sheng Wang1* The conventional framework for chemical bonding between main-group elements involves separate σ and π orbitals to describe multiple bonds. However, relativistic effects mix these orbitals in molecules containing heavy elements through spin– orbit coupling, leaving the total angular-momentum projection (ω) as the only good quantum number. Direct experimental evidence that relativistic effects change the σ-π bonding framework has remained elusive. Here, we probe the carbon- bismuth triple bond in the CBi− anion using high-resolution cryogenic photoelectron spectroscopy, coupled with relativistic four-component Dirac-Coulomb coupled-cluster calculations. …
摘自《科学》(Science)第393卷 第6807期 · 2026年7月9日,D. Kahraman et al.。仅引用开头一小段供了解文章,版权归原刊所有,全文请阅读原刊。
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