![]() Since Fe 2+ has six d-electrons, the complex attains an 18-electron configuration, which accounts for its stability. These twelve π-electrons are then shared with the metal via covalent bonding. The number of π-electrons on each ring is then six, which makes it aromatic according to Hückel's rule. Thus ferrocene could be described as iron(II) bis( cyclopentadienide), Fe 2+ 2. Each cyclopentadienyl (Cp) ring should then be allocated a single negative charge. Mössbauer spectroscopy indicates that the iron center in ferrocene should be assigned the +2 oxidation state. The discovery was considered so significant that Wilkinson and Fischer shared the 1973 Nobel Prize for Chemistry "for their pioneering work, performed independently, on the chemistry of the organometallic, so called sandwich compounds". It also led to an explosion of interest in compounds of d-block metals with hydrocarbons. However, it can be argued that it was ferrocene's discovery that began organometallic chemistry as a separate area of chemistry.
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