Heteroleptic, two-coordinate [M(NHC){N(SiMe3)2}] (M = Co, Fe) complexes: synthesis, reactivity and magnetism rationalized by an unexpected metal oxidation state

Abstract : The linear, two-coordinate and isostructural heteroleptic [M(IPr){N(SiMe3)2}] (IPr = 1,3-bis(diisopropyl-phenyl)-imidazol-2-ylidene), formally M(I) complexes (M = Co, 3; Fe, 4) were obtained by the reduction of [M(IPr)Cl{N(SiMe3)2}] with KC8, or [Co(IPr){N(SiMe3)2}2] with mes*PH2, mes* = 2,4,6-tBu3C6H2. The magnetism of 3 and 4 implies Co(II) and Fe(II) centres coupled to one ligand-delocalized electron, in line with XPS and XANES data; the ac susceptibility of 4 detected a pronounced frequency dependence due to slow magnetiza-tion relaxation. Reduction of [Fe(IPr)Cl{N(SiMe 3)2}] with excess KC 8 in toluene gave the heteronuclear 'inverse-sandwich' Fe–K complex 7, featuring 6-toluene sandwiched between one Fe(0) and one K(+) centre.
Complete list of metadatas

Cited literature [35 references]  Display  Hide  Download

https://hal.archives-ouvertes.fr/hal-01430505
Contributor : Gilles Frison <>
Submitted on : Tuesday, January 10, 2017 - 12:47:32 AM
Last modification on : Monday, July 8, 2019 - 11:26:04 AM
Long-term archiving on : Tuesday, April 11, 2017 - 1:22:58 PM

File

DT_2017.pdf
Publication funded by an institution

Licence


Distributed under a Creative Commons Attribution - NonCommercial 4.0 International License

Identifiers

Citation

Andreas Danopoulos, Pierre Braunstein, Kirill Monakhov, Jan van Leusen, Paul Kögerler, et al.. Heteroleptic, two-coordinate [M(NHC){N(SiMe3)2}] (M = Co, Fe) complexes: synthesis, reactivity and magnetism rationalized by an unexpected metal oxidation state. Dalton Transactions, Royal Society of Chemistry, 2017, ⟨10.1039/c6dt03565e⟩. ⟨hal-01430505⟩

Share

Metrics

Record views

2221

Files downloads

526