Synthesis and structural characterisation of a mixed Mo/Fe, mixed chalcogen, PhS-bridged cluster

Thermolytic reaction of Cp2Mo2Fe2STe(CO)7 and C6H5SH in benzene afforded two isomers of the new compound Cp2Mo2Fe2(μ3-S)(μ3-Te)(μ2-SPh)(μ3-H)(CO)5 in 23 and 21% yields. They were characterised by IR, 1H- and 125Te-NMR spectroscopy. The structure of one isomer was established by single crystal X-ray diffraction method. The structure consists of a Mo2Fe2 tetrahedron with μ3-S and μ3-Te face capping ligands. The Mo-Mo bond is bridged by a SPh group and one MoFe2 face is bridged by a μ-H group. Each Fe atom has two terminal carbonyls and one CO group bridges the Fe-Fe bond