Molybdenum multiple species

Oxidation Catalysis. The multiple oxidation states available in molybdenum oxide species make these exceUent catalysts in oxidation reactions. The oxidation of methanol (qv) to formaldehyde (qv) is generally carried out commercially on mixed ferric molybdate—molybdenum trioxide catalysts. The oxidation of propylene (qv) to acrolein (77) and the ammoxidation of propylene to acrylonitrile (qv) (78) are each carried out over bismuth—molybdenum oxide catalyst systems. The latter (Sohio) process produces in excess of 3.6 x 10 t/yr of acrylonitrile, which finds use in the production of fibers (qv), elastomers (qv), and water-soluble polymers. 

Molybdenum Clusters of the Type Mo Cl L. The chemistry described here was initiated with the notion that it should be possible to observe addition of molecular species X-Y across multiple metal-metal bonds, for example as in the process... 

There are many compounds and complexes of molybdenum in the V and VI oxidation states in which there are one or more oxygen atoms bound to the molybdenum by multiple bonds that can be represented Mo=0, since they are evidently approximately double bonds. There are also oxo species with either linear or non-linear M—O—M bridges. While there are certain resemblances in this oxo chemistry to that of Cr, and while tungsten also forms some analogous compounds, by far the most extensive chemistry is known for molybdenum. Some important relationships have been summarized above in Fig. 26-C-9. 

X = Cl or NMe,), undergo elimination of HX to afford the novel species [CpM(CO)2(POCH CH O)] containing M-P double bonds. The phosphavinylidene complex CpMo(CO)2lP C(SiMe2)2 has a two-coordinate phosphorus atom engaged in multiple bonding to both carbon and molybdenum. ... 

The detection of multiple forms of oxidized and semi-reduced FeMoco has important implications with regard to the structure and function of cofactor. Derivation of these species from the iron-molybdenum center in the protein is illustrated in Scheme 1. This behavior is based on the electrochemical and EPR results presented in the previous sections. 

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