Convenient access to new mono- and dinuclear organometallic hydrazones from [(η5-Cp)Fe(η6-arylhydrazine)]+

Homodimetallic iron(II) hydrazones: syntheses, spectroscopic, electrochemical, and theoretical investigations. X-Ray crystal structure of both syn- and anti- rotamers of [(η5-Cp)Fe(η6-C6H5)–NHNC(Me)–(η5-C5H4) Fe(η5-Cp)]+PF6–

“…À that are present in the same asymmetric unit, and its solution dynamics that reveal the two rotational barriers of the sandwich moieties about the -N(H)-N=C(Me)-spacer; and (iv) finally, DFT calculations on the [9] 2þ=þ=0 series as well as on related mononuclear models, which provide a theoretical rationalization of the electronic interaction between the metal centers. Some of the experimental results have been previously communicated.…”

“…All the new compounds were characterized by elemental analysis and IR, UV-Vis and 1 H NMR spectroscopies. For compound [9] þ PF 6 À , the activation energy DG # for the hindered rotations of the mixed sandwich [CpFe(Z 6 -C 6 H 5 -)] þ (41.8 ± 0.9 and 41.2 ± 3.7 kJ mol À1 ) and the ferrocenyl unit (40.0 ± 3.2 kJ mol À1 ) about the -NH-N=CMe-hydrazone backbone have been determined by variable temperature 1 H NMR spectroscopic studies. The electrochemical behavior of the dinuclear hydrazones was explored by cyclic voltammetry, and features the role of the cationic [CpFe(Z 6 -arene)] þ moiety as an electron acceptor.…”

“…The electrochemical behavior of the dinuclear hydrazones was explored by cyclic voltammetry, and features the role of the cationic [CpFe(Z 6 -arene)] þ moiety as an electron acceptor. The crystalline and molecular structure of [9] þ PF 6…”

“…The structure shows the presence of both syn and anti rotamers in the asymmetric unit. The analysis of the electronic structure of [9] þ through DFT calculations indicate a strong perturbation of the metal centers by the hydrazone bridge as well as some metalmetal interaction through the bridge.…”

“…) and [CpFe(Z 6 -p-RC 6 H 4 )-NHN=CMe-(Z 5 -C 5 H 4 )FeCp] þ PF 6 [11] þ PF 6 À ); (ii) the electrochemical and solvatochromic behavior of these seven new dinuclear hydrazone compounds; (iii) the crystal structure of both syn-and anti-rotamers of compound [9] þ PF 6…”