Synthesis and characterisation of cis and trans isomers of the mixed chalcogen clusters Cp2Mo2Fe2(CO)8(μ3-S)(μ3-Se) and Cp2Mo2Fe2(CO)8(μ3-S)(μ3-Te)
作者:Pradeep Mathur、Saurav Chatterjee、Sanjukta Ghose、Mary F. Mahon
DOI:10.1016/s0022-328x(99)00285-5
日期:1999.9
The reaction of Fe-2(CO)(6)(mu-SSe) and Cp2Mo2(CO)(4) in benzene at room temperature for 2 h, yielded the new isomeric mixed-metal, mixed-dichalcogenide clusters trans-Cp2Mo2Fe2(CO)(8)(mu(3)-S)(mu(3)-Se) (1) and cis-Cp2Mo2Fe2(Co)(8)(mu(3)-S)(mu(3)-Se) (4). The new mixed-metal clusters 1 and 4 could also be obtained when Fe-3(CO)(9)(mu(3)-S)(mu(3)-Se) and Cp2Mo2(CO)(6) were heated at 65 degrees C in benzene for 36 h. Similarly, the room-temperature reaction of Fe-2(CO)(6)(mu-STe) with Cp2Mo2(CO)(4) in benzene for 2 h and the thermolytic reaction of Fe-3(CO)(9)(mu(3)-S)(mu(3)-Te) with Cp2Mo2(CO)(6) in benzene for 36 h afforded the new isomeric clusters trans-Cp2Mo2Fe2(CO)(8)(mu(3)-S)(mu(3)-Te) (9) and cis-Cp2Mo2Fe2(CO)(8)(mu(3)-S)(mu(3)-Te) (11). The new clusters have been characterised by IR and by H-1-, Se-77-, Te-125-NMR spectroscopy. Clusters 1 and 4 have also been structurally characterised by single-crystal X-ray diffraction methods. (C) 1999 Elsevier Science S.A. All rights reserved.