Synthesis, structures and spectroelectrochemistry of methyl-substituted bis(η5-indenyl)iron(II) complexes

Synthesis and structure of mono- and dinuclear cyclopentadienyl–indenyl complexes of iron(II) and further reactions to mixed tri- and tetranuclear iron–cobalt complexes

“…The averages of these Fe-C bond lengths are 2.058 Å in 1 and meso-2, and 2.062 and 2.057 Å in rac-3. All these Fe-C distances are in good agreement with the respective values reported for (g 5 -4,7-dimethylindenyl)(g 5 -pentamethylcyclopentadienyl)iron(II) [21] and bis(g 5 -cyclopentadienyl)[1,1 0 -tetramethyldisiloxy-2,2 0 -bis(g 5 -indenyl)]diiron(II) [22] and also with those values found in substituted bis(g 5 -indenyl)iron(II) complexes [23]. The relatively large range of the Fe-C bond distances indicates that the g 5 -coordination towards the indenyl ligand is not perfect, but displays some extent of ene-allyl distortion and is hence better described as a g 3 + g 2 mode.…”

(Indenyl)Iron Complex [(η5‐indenyl)Fe(η‐C6H6)]+: Synthesis, Arene Exchange Reactions and Bonding

“…The signals of the carbon atoms in the 13 C NMR spectra of the indenyl complexes 2 , 3 b and 3 c were assigned by analogy with bis(indenyl)irons according to numbering scheme given in Scheme . The introduction of methyl substituents into the benzene ring leads to slight upfield shift (Δδ=0.3–2.0 ppm) of signals of indenyl six‐membered ring (C4/7 and C5/6) and downfield shift (Δδ=1.7–4.0 ppm) of signals of indenyl five‐membered ring (C1/3 and C2); the signals of C2 are shifted in greatest extent (by 2.0 ppm per each three methyl groups).…”

Stabilization of η3-indenyl compounds by sterically demanding N,N-chelating ligands in the molybdenum coordination sphere

“…[25][26][27][28][29] The kinetic "indenyl effect" has been comprehensively scrutinized on various molybdenum compounds by 4 ] is unusually stable, while the indenyl analogue undergoes a spontaneous and very fast ringopening to [(h 5 -Ind)(h 5 -C 5 H 4 CH 2 -h 1 -CH 2 )Mo(CO)] [BF 4 ]. 36,37 Results and discussion Reactions of [{(h 5 -4,7-Me 2 C 9 H 5 )Mo(CO) 2 (m-Cl)} 2 ] (2) with py, bpy, phen and pyma Reaction of [{(h 5 -4,7-Me 2 C 9 H 5 )Mo(CO) 2 (m-Cl)} 2 ] (2) with pyridine (py) gives a monomeric compound with h 5 -bonded indenyl ligand [(h 5 -4,7-Me 2 C 9 H 5 )Mo(CO) 2 (py)Cl] (3), see Scheme 2. It will be shown that a steric congestion of the chelating ligand is critical for the stability of [(h 3 -4,7-Me 2 C 9 H 5 )Mo(CO) 2 ( N,N L)Cl] and could be used for the control of the indenyl ring slippage.…”

“…22 This substitution pattern usually has only negligible effect on the reactivity due to subtle steric and electronic effects of two methyl groups in the C 6ring. 36,37…”