Masked Radicals: Iron Complexes of Trityl, Benzophenone, and Phenylacetylene.
Organometallics
; 38(21): 4224-4232, 2019 Nov 11.
Article
en En
| MEDLINE
| ID: mdl-34103782
ABSTRACT
We report the first FeâCPh3 complex, and show that the long FeâC bond can be disrupted by neutral π-acceptor ligands (benzophenone and phenylacetylene) to release the triphenylmethyl radical. The products are formally iron(I) complexes, but X-ray absorption spectroscopy coupled with density functional and multireference ab initio calculations indicates that the best description of all the complexes is iron(II). In the formally iron(I) complexes, this does not imply that the π-acceptor ligand has radical character, because the iron(II) description arises from doubly-occupied frontier molecular orbitals that are shared equitably by the iron and the π-acceptor ligand, and the unpaired electrons lie on the metal. Despite the lack of substantial radical character on the ligands, alkyne and ketone fragments can couple to form a high-spin iron(III) complex with a cyclized metalladihydrofuran core.
Texto completo:
1
Banco de datos:
MEDLINE
Idioma:
En
Año:
2019
Tipo del documento:
Article