BrMg(CH2)4MgBr reductively cleaved the S-S bond of 2 mols. of m-S2Fe2(CO)6 to give [(m-BrMgS)Fe2(CO)6]-(m-S(CH2)4S)-[(m-BrMgS)Fe2(CO)6] (I), which contains a bridging butylene group and 2 Fe2S2 cluster cores. Reactions of I with alkyl halides, chromomethyl Me ether, chloroketones, chloroesters or acyl chlorides in situ give 10 [(m-RS)Fe2(CO)6]-m-(S(CH2)4S)[(m-RS)Fe2(CO)6] (II). For all II structures were established by IR, 1H NMR and C, H anal. while conformers of some complexes were deduced from 1H NMR data.

Key words: MOLECULAR STRUCTURE, X-RAY DIFFRACTION ANALYSIS, IRON COMPLEX, CARBONYL COMPLEX, CLUSTER COMPOUND, TRANSITION METAL COMPLEX, POLYNUCLEAR COMPLEX, SULFIDE COMPLEX, CONFORMATION, SULFUR COMPOUNDS