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Ferrocene density g ml
Cyclopentadienyl iron(II) oxide (FcCl2) is a crystalline orange solid, with one iron ion coordinated to two cyclopentadienyl ions. The compound is soluble in organic solvents and undergoes substitution reactions on the cyclopentadienyl rings to give a variety of mono-functionalized derivatives.
The oxidation of ferrocene produces an ionic cation with a low potential, around 0.5 V versus a saturated calomel electrode (SCE). This is a unique one-electron oxidation which is not observed in other aromatic hydrocarbons, making it a promising material for application as a redox-responsive storage medium and indicative sensor.
X-ray photoelectron spectroscopy of aerogels with ferrocene inclusions confirmed the inclusion of ferrocene units in the polycondensation sol-gel structure and revealed that they are located on the hydroxyl (OH) side of the cyclopentadienyl carbons. Moreover, the Fe Mossbauer spectra of the aerogel samples exhibited characteristic relaxation behavior in the presence of ferrocene.
The Fe-orbitals of the ferrocene atoms overlap with the pi electrons in the cyclopentadienyl orbitals to form a sandwich arrangement similar to the metallocenes biferrocene and tiferrocene. This sandwich structure is not only observable in X-ray crystallography but also in NMR spectroscopy.
In synthesis, cyclopentadienyl iron(II) and anhydrous ferric chloride are added to a tetrahydrofuran solution; the reaction is carried out for 4.5 h under a nitrogen atmosphere of 300 degrees centigrade. Then the tetrahydrofuran solvent is removed by evaporation under reduced pressure to produce nearly dry residue.
In addition to its unique redox property, ferrocene has a variety of other important properties including high thermal and chemical stability and liquid crystallinity. It is a suitable candidate for applications in redox-responsive storage materials and indicative sensors because of its reversible oxidation-reduction behaviour.