Fe3Te2(CO)9 is shown to be a useful precursor to a variety of heterometallic carbonyl clusters in reactions which appear to proceed via the intermediacy of Fe2(Te2)(CO)6. Fe3Te2(CO)9 decomposed in polar solvents to give Fe2(Te2)(CO)6 which could be dimerized to Fe4Te4(CO)12. Fe3Te2(CO)9 reacted with C5H5Co(CO)2 and Pt(C2H4)(PPh3)2 to give good yields of (C5H5CO)Fe2Te2(CO)7 and Fe2PtTe2(CO)6(PPh3)2, respectively. (C5H5Co)Fe2Te2(CO)7 underwent reversible decarbonylation to give a mixture of two isomers of (C5H5Co)Fe2Te2(CO)6 as established by 125Te NMR spectroscopy. Upon reaction with Co2(CO)8, Fe3Te2(CO)9 gave Co2FeTe(CO)9 or Co4Te2(CO)11 depending on the reaction conditions. Co4Te2(CO)11, like Fe3Te2(CO)10 and (C5H5Co)Fe2Te2(CO)7, can be reversibly decarbonylated. The assembly of Co2FeTe(CO)9 may be mechanistically related to the conversion of Fe2(S2)(CO)6 to FeCo2S(CO)9 which was found to proceed via Co2Fe2S2(CO)11. Alternatively, Co2Fe2S2(CO)11 reacted photochemically with [C5H5Mo(CO)3]2 to give the known, chiral cluster (C5H5Mo)CoFeS(CO)8. While Fe2(Te2)(CO)6 thermally dimerized to Fe4Te4(CO)12, Fe2(S2)(CO)6 gave the analogous dimer only upon photolysis. In contrast to the stability of (C5H5CO)Fe2Te2(CO)7, the reaction of C5H5Co(CO)2 with Fe2(S2)(CO)6 gave only (C5H5CO)Fe2S2(CO)6 which is proposed to be structurally related to Fe3S2(CO)9 and not (C5H5Co)3S2 or Fe2PtS2(CO)6(PPh3)2.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Materials Chemistry