Quadruple Bonding Between Iron and Boron in the BFe(CO) Complex

Overview

Journal Nat Commun

Specialty Biology

Date 2019 Oct 19

PMID 31624260

Citations 7

Authors

Chaoxian Chi

Jia-Qi Wang

Han-Shi Hu

Yang-Yang Zhang

Wan-Lu Li

Luyan Meng

Mingbiao Luo

Mingfei Zhou

Jun Li

Affiliations

Soon will be listed here.

Abstract

While main group elements have four valence orbitals accessible for bonding, quadruple bonding to main group elements is extremely rare. Here we report that main group element boron is able to form quadruple bonding interactions with iron in the BFe(CO) anion complex, which has been revealed by quantum chemical investigation and identified by mass-selected infrared photodissociation spectroscopy in the gas phase. The complex is characterized to have a B-Fe(CO) structure of C symmetry and features a B-Fe bond distance that is much shorter than that expected for a triple bond. Various chemical bonding analyses indicate that the complex involves unprecedented B≣Fe quadruple bonding interactions. Besides the common one electron-sharing σ bond and two Fe→B dative π bonds, there is an additional weak B→Fe dative σ bonding interaction. This finding of the new quadruple bonding indicates that there might exist a wide range of boron-metal complexes that contain such high multiplicity of chemical bonds.

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