Synthesis of clusters Fe2(CO)6(μ-XCH2CH=CH2)(μ3-X)Fe(CO)2Cp (X = Se, S; Cp = η5-C5H5)

Abstract

The clusters Fe?(CO)6(g-XCH2CH=CH2)(~t3-X)Fe(CO)2Cp (X = S, Se) were prepared by the successive treatment of the bi-and trimetallic complexes Fe2(CO)6(u-Se2) and Fe3(CO)gQa3-X) with allylmagnesium chloride and CpFe(CO)2t. The clusters obtained contain a noncoordinated C=C bond. The structure of the Se-containing cluster was suggested on the basis of comparison of its spectral data (IR, tH NMR, and M6ssbauer spectra) with the spectra of the analogous S-containing complex, which was previously characterized by X-ray diffraction analysis.Key words: carbonyl clusters, cluster monomers, iron, sulfur, selenium, synthesis.Interest in cluster compounds of transition metals containing ligands with free olefin substituents is caused by the possibility of their copolymerization with traditional organic monomers. 1 This method for preparing metal-immobilized polymeric materials has been previously used for a series of Os3(CO)x2 derivatives z obtained by the coordination of unsaturated ligands on clusters containing the Os3-metallocycle. 3 Recently, we have suggested another approach to preparing "cluster monomers" (Scheme I). 4In this case, along with the addition of an unsaturated radical to the coordinated ligand, the skeleton of a new cluster is formed during the synthesis, which makes it possible to vary. the composition and structure of the obtained compounds more extensively. In terms of this approach, one may plan the development of "homologous" series of clusters. For this purpose, complexes containing not only S, but Se and Te as well, and at the second stage of the synthesis, electrophilic complexes of The present work is devoted to applying this synthetic approach to Se-containing iron carbonyl derivatives.