SYNTHESIS AND SPECTROSCOPIC CHARACTERIZATION OF (CO)(6)FE-2(MU-EC(H)=C(H)E') (E-NOT-EQUAL-E' E,E'=S, SE, TE) AND (CO)(6)FE-2(MU-TEC(H)=C(H)TE) - STRUCTURAL CHARACTERIZATION OF (CO)(6)FE-2(MU-SC(PH)=C(H)SE) AND(CO)(6)FE-2(MU-SC(H)=C(PH)TE)

When acetylene gas was bubbled through methanol solutions containing t he mixed-chalcogenide compounds (CO)(6)Fe-2(mu-EE') (E not equal E'; E , E' = S, Se, Te), the acetylene adducts (Co)(6)Fe-2{mu-EC(H)=C(H)E'} (1, 52%, E, E' = S, Se; 2, 46%, Et E' = S, Te; 3, 38%, E, E' = Se, Te) were obtained, In addition, trace amounts of the homochalcogenide der ivatives (CO)(6)Fe-2-{mu-EC(H)=C(H)E} (E = S, Se, Te) were also obtain ed. The Te-2 compound (CO)(6)Fe-2{mu-TeC-(H)=C(H)Te) (4) was obtained in 32% yield from the reaction of (CO)(6)Fe-2(mu-Te-2) with acetylene. Compounds 1-4 were characterized by IR and H-1, C-13, Se-77, and Te-1 25 NMR spectroscopy. Crystallographic analysis of the phenylacetylene adducts (CO)(6)Fe-2{mu-SC(Ph)=C(H)Se} (5) and (CO)(6)Fe-2(CO)(6)Fe-2{m u-SC(H)=C(Ph)Te) (6) were carried out. The structures of both 5 and 6 can be described as Fe(2)SE (E = Se, Te) tetrahedral butterfly cores c ontaining the phenylacetylene as a bridge between the two wingtip chal cogen atoms, with three terminally bonded carbonyl groups on each Fe a tom.