In the reaction of Na
2Se with [Fe(CO)
5] in isopropanol with subsequent acidification with HCl, which is used to synthesize [(μ-H)
2Fe
3(μ
3-Se)(CO)
9] (
II), the cluster [(μ-H)
2Fe
5(μ
3-Se)
2(CO)
14] (
I) was detected. In assumption that compound
I could serve as a suitable synthon for preparing the bulky heterometallic clusters, its reactions with the Rh-containing complexes
were studied. The reaction of
I with [Rh(CO)
2Cp*] (Cp* is pentamethylcyclopentadienyl) was found to give a mixture of the products. The main reaction products were isolated
and their structures were determined: [Fe
2Rh(μ
3-Se)
2(CO)
6Cp*], [Fe
2Rh(μ
3-Se)(μ
3-CO)(CO)
6Cp*], [FeRh
2(μ
3-Se)(μ-CO)(CO)
3Cp
2*], [Fe
2Rh
2(μ
4-Se)(μ-CO)
4(CO)
2Cp
2*]. Potassium hydride treatment of
II with subsequent addition of [Cp*Rh(CH
3CN)
3](CF
3SO
3)
2 leads to the well-known cluster complex [Fe
3Rh(μ
4-Se)(CO)
9Cp*]. A set of the reaction products indicates that the {Fe
5Se
2} core cannot be used as one-piece “building block” in the synthesis of heterometallic clusters.
Original Russian Text © D.A. Bashirov, N.A. Pushkarevsky, A.V. Vitovets, O. Fuhr, S.N. Konchenko, 2008, published in Koordinatsionnaya
Khimiya, 2008, Vol. 34, No. 10, pp. 748–758.