Inverse-Sandwich Cyclobutadiene Dinickel Complexes: Synthesis and Structural Characterization

Synthesis and structural characterization of inverse-sandwich complexes, whose planar conjugated ligand is a cyclobutadiene, have attracted much attention for their unique chemical bonding modes and synthetic methods. In this article, a new class of inverse sandwich cyclobutadiene dinickel complexes...

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Bibliographic Details
Published in:Bulletin of the Chemical Society of Japan 2020-11, Vol.93 (11), p.1314-1318
Main Authors: Yu, Chao, Wu, Botao, Yang, Zhenqiang, Chen, Hui, Zhang, Wen-Xiong, Xi, Zhenfeng
Format: Article
Language:English
Subjects:
Antiferromagnetism
Butadiene
Chemical bonds
Chemical synthesis
Coordination compounds
Coupling
Frontiers of Molecular Science
Ligands
Magnetic measurement
Nickel
Orbitals
Reagents
Structural analysis
Transition metals
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Summary:Synthesis and structural characterization of inverse-sandwich complexes, whose planar conjugated ligand is a cyclobutadiene, have attracted much attention for their unique chemical bonding modes and synthetic methods. In this article, a new class of inverse sandwich cyclobutadiene dinickel complexes, the first case of inverse sandwich cyclobutadiene complexes with transition metals, were synthesized from the reaction of dilithio reagents with NiBr2. Magnetometry and DFT calculations have revealed that the two nickel centers have antiferromagnetic coupling with each other and there exists electron back donation from the Ni(3d) orbitals to the π* orbital of the cyclobutadiene ligand. Besides, the inverse sandwich cyclobutadiene dinickel complex could be reversed, being transformed to its corresponding normal sandwich complex, the bis(cyclobutadiene) nickel complex.
ISSN:0009-2673
1348-0634
DOI:10.1246/bcsj.20200156