1989
DOI: 10.1016/s0020-1693(00)80792-6
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Mössbauer effect, 13C NMR and IR study of the effect of bulky Cp substituents and CO substitution on the structure and bonding of mono- and dinuclear organoiron complexes

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Cited by 13 publications
(5 citation statements)
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“…Modelling the Mössbauer spectra indicated isomer shifts ( δ ) of 0.08±0.05 mm s −1 (|Δ E Q |=1.79±0.09 mm s −1 ) and 0.58±0.07 mm s −1 (|Δ E Q |=0.78±0.13 mm s −1 ). The former doublet is similar to those found in CpFe 0 (CO) 2 compounds, such as that in B ( δ 190 K =0.08 mm s −1 , |Δ E Q |=1.73 mm s −1 ) and has a smaller isomer shift than Fe II compounds with similar coordination environments, such as CpFe II (CO) 2 Cl (( δ 220 K =0.14 mm s −1 , |Δ E Q |=1.83 mm s −1 ), and smaller than the anion, K[CpFe 0 (CO) 2 ] (( δ 80 K =0.16 mm s −1 , |Δ E Q |=2.07 mm s −1 ) [18,22] . The other doublet is comparable to those for high‐spin three coordinate L c Fe II X species, for example L c FeCl ( δ 4.2 K =0.74 mm s −1 , |Δ E Q |=1.61 mm s −1 ) and L c FeCH 3 ( δ 4.2 K =0.48 mm s −1 , |Δ E Q |=1.74 mm s −1 ; L c =3,5‐bis(2,6‐diisopropylphenylimido)‐2,6‐dimethylheptyl) [23] .…”
Section: Figurementioning
confidence: 99%
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“…Modelling the Mössbauer spectra indicated isomer shifts ( δ ) of 0.08±0.05 mm s −1 (|Δ E Q |=1.79±0.09 mm s −1 ) and 0.58±0.07 mm s −1 (|Δ E Q |=0.78±0.13 mm s −1 ). The former doublet is similar to those found in CpFe 0 (CO) 2 compounds, such as that in B ( δ 190 K =0.08 mm s −1 , |Δ E Q |=1.73 mm s −1 ) and has a smaller isomer shift than Fe II compounds with similar coordination environments, such as CpFe II (CO) 2 Cl (( δ 220 K =0.14 mm s −1 , |Δ E Q |=1.83 mm s −1 ), and smaller than the anion, K[CpFe 0 (CO) 2 ] (( δ 80 K =0.16 mm s −1 , |Δ E Q |=2.07 mm s −1 ) [18,22] . The other doublet is comparable to those for high‐spin three coordinate L c Fe II X species, for example L c FeCl ( δ 4.2 K =0.74 mm s −1 , |Δ E Q |=1.61 mm s −1 ) and L c FeCH 3 ( δ 4.2 K =0.48 mm s −1 , |Δ E Q |=1.74 mm s −1 ; L c =3,5‐bis(2,6‐diisopropylphenylimido)‐2,6‐dimethylheptyl) [23] .…”
Section: Figurementioning
confidence: 99%
“…The former doublet is similar to those found in CpFe 0 (CO)2 compounds, such as that in Ar′Fe-Fp (d 190 K = 0.08 mm s -1 , |DEQ| = 1.73 mm s -1 ) and has a smaller shift than Fe II compounds with similar coordination environments, such as CpFe II (CO)2Cl (d 220 K = 0.14 mm s -1 , |DEQ| = 1.83 mm s -1 ), and smaller than the anion, K[CpFe 0 (CO)2] (d 80 K = 0.16 mm s -1 , |DEQ| = 2.07 mm s -1 ). [18,22] The other doublet is comparable to values for high-spin three coordinate L c Fe II X species, for example L c FeCl (d 4.2 K = 0.74 mm s -1 , |DEQ| = 1.61 mm s -1 ) and L c FeCH3 (d 4.2 K = 0.48 mm s -1 , |DEQ| = 1.74 mm s -1 ) (L c = 3,5-bis(2,6-diisopropylphenylimido)-2,6-dimethylheptyl). [23] These data led to a working model for the complex that assigns the sites as being a low-spin Fe 0 (CpFe(CO)2) and a high-spin Fe II (LFe).…”
Section: Introductionmentioning
confidence: 99%
“…12 and -1.35, respectively, clearly indicating an intramolecular electron transfer from Fe(1) to Fe(2). A similar effect was observed in 2, where natural charges for Mn(1) and Fe(1) of +1.18 and -1.34, respectively, were calculated.…”
mentioning
confidence: 98%
“…11 Another signal (δ ) 0.08 mm/s, ∆E Q ) 1.73 mm/s at 190 K) was consistent with an Fe atom in an [(η 5 -C 5 H 5 )Fe(CO) 2 ] fragment. 12 In addition, a signal (δ ) 0.15 mm/s, ∆E Q ) 1.94 mm/s at 190 K) indicated the presence of some [(η 5 -C 5 H 5 )Fe(CO) 2 ] 2 dimer (literature value: δ ) 0.227(2) mm/s, ∆E Q ) 1.912(5) mm/s at 77 K), 12 whose presence could be due to disproportionation or oxidation of 1.…”
mentioning
confidence: 99%
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