Abstract

The influence of differently substituted cyclopentadienyl CpR ligands on the reaction outcome of [CpRFe(CO)2]2 (CpR = C5Me5, EtC5Me4, 1,3-Bu2tC5H3) with As4 is examined. For C5Me5 and EtC5Me4, the pentaarsaferrocene derivatives [CpRFe(η5-As5)] are formed together with [(CpRFe)3As6] and [(CpRFe)3As6{(η3-As3)Fe}], while for 1,3-Bu2tC5H3 only [(CpRFe)3As6] is formed. The reaction of [(Me5C5Fe)3As6{(η3-As3)Fe}] with Tl+ leads to [{(Me5C5Fe)3As6Fe}2(μ,η3:η3-As3)]2+ representing an unexpected dicationic cluster.

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