TY - JOUR
T1 - Structural Characterization and Bonding Analysis of [Hg{Fe(CO)5}2]2+ [SbF6]−2
AU - Rupf, Susanne M.
AU - Pan, Sudip
AU - Moshtaha, Amina L.
AU - Frenking, Gernot
AU - Malischewski, Moritz
N1 - Publisher Copyright:
© 2023 American Chemical Society.
PY - 2023/7/19
Y1 - 2023/7/19
N2 - The non-classical carbonyl complex [Hg{Fe(CO)5}2]2+ [SbF6]−2 is prepared by reaction of Hg(SbF6)2 and excess Fe(CO)5 in anhydrous HF. The single-crystal X-ray structure reveals a linear Fe-Hg-Fe moiety as well as an eclipsed conformation of the eight basal CO ligands. Interestingly, the Hg-Fe bond length of 2.5745(7) Å is relatively similar to the corresponding Hg-Fe bonds in literature-known [Hg{Fe(CO)4}2]2- dianions (2.52-2.55 Å), which intrigued us to analyze the bonding situation in both the dications and dianions with the energy decomposition analysis with natural orbitals for chemical valence (EDA-NOCV) method. Both species are best described as Hg(0) compounds, which are also confirmed by the shape of the HOMO-4 and HOMO-5 of the dication and dianion, respectively, in which the electron pair is located mainly at the Hg. Furthermore, for the dication and the dianion, the σ back-donation from Hg into the [Fe(CO)5]22+ or the [Fe(CO)4]22- fragment is the most dominant orbital interaction and surprisingly these interaction energies are also very similar even in absolute values. The fact that both iron-based fragments are missing two electrons explains their prominent σ-acceptor properties.
AB - The non-classical carbonyl complex [Hg{Fe(CO)5}2]2+ [SbF6]−2 is prepared by reaction of Hg(SbF6)2 and excess Fe(CO)5 in anhydrous HF. The single-crystal X-ray structure reveals a linear Fe-Hg-Fe moiety as well as an eclipsed conformation of the eight basal CO ligands. Interestingly, the Hg-Fe bond length of 2.5745(7) Å is relatively similar to the corresponding Hg-Fe bonds in literature-known [Hg{Fe(CO)4}2]2- dianions (2.52-2.55 Å), which intrigued us to analyze the bonding situation in both the dications and dianions with the energy decomposition analysis with natural orbitals for chemical valence (EDA-NOCV) method. Both species are best described as Hg(0) compounds, which are also confirmed by the shape of the HOMO-4 and HOMO-5 of the dication and dianion, respectively, in which the electron pair is located mainly at the Hg. Furthermore, for the dication and the dianion, the σ back-donation from Hg into the [Fe(CO)5]22+ or the [Fe(CO)4]22- fragment is the most dominant orbital interaction and surprisingly these interaction energies are also very similar even in absolute values. The fact that both iron-based fragments are missing two electrons explains their prominent σ-acceptor properties.
UR - http://www.scopus.com/inward/record.url?scp=85164726127&partnerID=8YFLogxK
U2 - 10.1021/jacs.3c03064
DO - 10.1021/jacs.3c03064
M3 - 文章
C2 - 37413697
AN - SCOPUS:85164726127
SN - 0002-7863
VL - 145
SP - 15353
EP - 15359
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 28
ER -