SYNTHESIS AND REACTIVITY OF TRIIRON COMPLEXES CONTAINING SELENIDE ANDDISELENIDE BRIDGING LIGANDS - X-RAY STRUCTURE OF FE-3(3)(MU(2)-SE)(MU(3)-SE-2)(2)](PF6)(CP-ASTERISK = ETA(5)-C5ME5)

Reaction of CpFe-2(2)(CO)(4) with red selenium (Se-8) afforded an une xpected selenium-rich triiron complex Cp3Fe3Se5 (1). Air oxidation of 1 in the presence of NH4PF6 gave the monocationic complex [Cp3Fe3Se5 ](PF6) (2). An X-ray crystal structure analysis of 2 revealed that an Fe3Se5 core consists of three iron atoms, one mu(2)-selenide ligand, a nd two mu(3)-diselenide ligands with a side-on manner. Reactions of 2 with some simple reagents were also examined.