复旦大学化学系周鸣飞课题组近日发现了一种结构特殊的碳氧化物阴离子，相关论文于2020年11月19日发表于国际顶尖学术期刊《德国应用化学》。

研究人员在固态氖基质中生成了二氧化三碳阴离子C₃O₂^-。红外吸收光谱和量子化学计算表明，该离子具有C_s对称性的平面结构，其中两个键长和键角显著不同的CO基团以之字形的方式连接在中心碳原子上。

进一步的成键分析表明，对这一离子最准确的描述可以看做是由一个中性的三线态CO和双线态的CCO^-之间成键构成的。

附：英文原文

Title: Generation and Characterization of the C3O2‐ Anion with an Unexpected Unsymmetrical Structure

Author: Gernot Frenking, Lina Wang, Sudip Pan, Bo Lu, Xuelin Dong, Hongmin Li, Guohai Deng, Xiaoqing Zeng, Mingfei Zhou

Issue&Volume: 19 November 2020

Abstract: The carbon suboxide anion C₃O₂^‐ is generated in solid neon matrix. It is characterized by infrared absorption spectroscopy as well as quantum chemical calculations to have a planar  C_s  structure where two CO groups with significantly different bond lengths and angles are attached in a zigzag fashion to the central carbon atom. Bonding analysis indicates that it is best described by the bonding interactions between a neutral CO in a triplet excited state and a doublet excited state of CCO^‐  .

DOI: 10.1002/anie.202013921

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202013921