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The electrochemical behaviors of three half-sandwich iron(Ⅱ)complexes,[CpFe(CO)2X](Cp = cyclopentadienyl,1: X = Cl ; 2: X = Br ; 3: X = I)were investigated in Fig.1.For the three complexes,two reduction processes at ca [1].They are assigned to the reductions of Fe(Ⅱ)→ Fe(Ⅰ)couple and the reduction of [CpFe(μ-CO)(CO)]2(Fe2)dimer which was formed from the dimerization of the neutral intermediate([CpFeⅠ(CO)2])generated from the first reduction,respectively.The neutral intermediate formed by ejecting the halide X from the monoanion,[CpFe(CO)2X].