New cluster complexes of iron [Fe3Q(AsCp*)(CO)9] (Q = Se, Te, Cp* = C5(CH3)5) are synthesized with the square pyramidal cluster core Fe3QAs. A suitable procedure of the synthesis of known heterochalcogenide [Fe3QS(CO)9] clusters is developed. Monosubstituted [Fe3Q(AsCH3)(CO)8(PPh3)] and disubstituted [Fe3Q(AsCH3)(CO)7(PPh3)2] clusters formed in the reactions of [Fe3Q(AsCH3)(CO)9] with PPh3 are studied. In monosubstituted clusters, the phosphine ligand is coordinated in the axial position to the Fe atom in the base of the Fe3QAs square pyramid, while in disubstituted clusters, both phosphine ligands coordinate the Fe atoms in the pyramid base, one ligand being in the axial and another one in the equatorial position. The NMR data support the possibility of migration of the Fe-Fe bonds in a triangle in the cluster core in the case of disubstituted clusters.
Russian Journal of Coordination Chemistry – Springer Journals
Published: Jun 15, 2006
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