Probing the Hyperconjugative Aromaticity of Cyclopentadiene and Pyrroliums Containing Group 7 Transition Metal Substituents

Probing the Hyperconjugative Aromaticity of Cyclopentadiene and Pyrroliums Containing Group 7 Transition Metal Substituents
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含第7族过渡金属取代基的环戊二烯和吡咯的超共轭芳香性探讨

DOI:
10.1021/acs.organomet.2c00352
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发表时间:
2022-09
期刊:
影响因子:
2.8
通讯作者:
Jun Zhu
Jun Zhu
中科院分区:
化学2区
文献类型:
--
作者:
Shuwen Chen;Jun Zhu

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芳香性和超共轭是化学中的两个基本概念。将它们结合在一起导致Mulliken在1939年提出了超共轭芳香性的概念。目前,它已经引起了理论和实验化学家的极大关注。最近,超共轭芳香性的概念已经从主族取代基扩展到包括第9族、第10族和第11族过渡金属取代基的过渡金属体系。本文通过密度泛函理论计算,研究了含7族过渡金属取代基的环戊二烯和吡咯的超共轭芳香性。研究发现,金属-金属键的相互作用可以显着降低环戊二烯的芳香性,而更强的σ-供体配体,桥连氢化物和羰基可以提高芳香性。这些发现拓展了超共轭芳香性概念的范围,丰富了芳香族金属有机化学。
Aromaticity and hyperconjugation are two fundamental concepts in chemistry. Combining them together led to the proposal of the concept of hyperconjugative aromaticity by Mulliken in 1939. Now, it has been attracting considerable attention from both theoretical and experimental chemists. Recently, the concept of hyperconjugative aromaticity has been extended from main-group substituents to transition metal systems including groups 9, 10, and 11 transition metal substituents. Here, we report the hyperconjugative aromaticity in cyclopentadienes and pyrroliums containing group 7 transition metal substituents through density functional theory (DFT) calculations. It is found that the metal−metal bonding interaction can significantly reduce the aromaticity in cyclopentadienes, whereas the stronger σ-donor ligand, bridged hydride, and carbonyls can enhance aromaticity. All these findings.expand the scope of the concept of hyperconjugative aromaticity, enriching aromatic organometallic chemistry.
DOI: 10.1038/s42004-020-00419-5
发表时间: 2020-11-10
影响因子: 5.9
作者:
Zhu, Jun
通讯作者: Zhu, Jun
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