THE STUDY OF ISOLOBAL DISPLACEMENT-REACTIONS - SYNTHESIS AND STRUCTURES OF THE HETEROBIMETALLIC MU-ALKYNE CLUSTER COMPLEXES ETA(5)-RC5H4(CO)2M(MU-R1C2R2)CO(CO)3 (M=MO, W R=CH3C(O), CH3O2C)

Eta5-CH3C(O)C5H4(CO)2Mo(mu-C6H5C2C6H-5)CO(CO)3 (1a), eta5-CH3C(O)C5H4(CO)2Mo(mu-p-CH3C6H4C2C6H5)Co(CO)3 (1b), eta5-CH3O2CC5H4(CO)2Mo(mu-C6H5C2C6H5)CO(CO)3 (1C), eta5-CH3C(O)C5H4(CO)2W(mu-C6H5C2C6H5)(Co(CO)3 (1d) and eta5-CH3O2CC5H4(CO)2W(mu-C6H5C2C6H5)CO(CO)3 (1e) were prepared by reactions of the corresponding sodium salts of functionally substituted cyclopentadienyl carbonyl molybdenum (tungsten) anions with (CO)3Co(mu-CH5C2C6H5)Co(CO)3 or (CO)3Co(mu-P-CH3C6H5C2C6H5)Co(CO)3, respectively. The compounds 1a-1e were characterized by elemental analysis, IR, H-1 NMR and mass spectroscopy, while the structure of 1c was further established by X-ray diffraction analysis. The compound crystallizes in the monoclinic space group P2(1)/n with a=8.503(1), b=26.721(7), c=11.033(2) angstrom; beta=106.09(2)-degrees; V=2408 angstrom3; and Z=4.