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• W2912609772 abstract "The synthesis, characterization and transformation of the thermally unstable {Fe(NO)2}9 dinitrosyl iron complex (DNIC) [(OMe)2Fe(NO)2]- (2) were investigated. The {Fe(NO)2}9 DNIC 2 characterized by single-crystal X-ray diffraction is exclusively stabilized by the weak intermolecular [Fe(OMe)2(K+)] interactions (O(3)K(1) and O(4)K(1) distances of 2.818(3) and 2.810(3) Å, respectively). The binding affinity of chalcogenolate-containing ligands toward the {Fe(NO)2}9 motif follows the series [SEt]- > [SPh]- > [OPh]- > [OMe]-, which is dictated by the synergistic cooperation of the electron-donating order ([SEt]- > [SPh]- > [OPh]-) and the soft-hard order (from soft to hard, [SEt]- ∼ [SPh]- > [OPh]- > [OMe]-). In comparison with the XAS Fe K-edge pre-edge energy of {Fe(NO)2}9 [(RS)2Fe(NO)2]- (R = Ph (4), Et (5)) and [(PhO)2Fe(NO)2]- (6) DNICs falling within the reported range of 7113.4-7113.9 eV, the distinctive pre-edge energy of 7114.2 eV exhibited by complex 2 suggests that the electronic structure of {Fe(NO)2}9 DNIC 2 may be qualitatively described as a {FeIII(NO-)2}9 electronic structure induced by the dominant ionic character of Fe-OMe bonds, instead of the resonance hybrids of {FeII(NO-)(˙NO)}9 and {FeIII(NO-)2}9 electronic structures induced by the dominant metal-ligand covalency of {Fe(NO)2}9 DNICs 4-6. As shown in TD-DFT computation, the increased population of NO ligands in MO 125β (45.1% NO) attenuating the OMe-induced polarization imposed on the Fe center through the delocalized covalent nature of Fe-NO bonds supports the lower/synergistic NO/OMe → Fe charge transfer energy (1216 nm) observed in the solid-state UV-vis spectrum of complex 2 compared to those (1140 nm) of complexes 4-6." @default.
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• W2912609772 date "2019-01-01" @default.
• W2912609772 modified "2023-10-01" @default.
• W2912609772 title "Insight into chalcogenolate-bound {Fe(NO)₂}⁹dinitrosyl iron complexes (DNICs): covalent character<i>versus</i>ionic character" @default.
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• W2912609772 doi "https://doi.org/10.1039/c8dt04670k" @default.
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