Molybdenum pyrophoric

During the preparation of the complexes of chromium, molybdenum and tungsten from K[M(CO)3C5H5] and bromosilane, the residues from sublimation of the products are all pyrophoric. 

Reduction of [Mo(CO)4(TMEDA)J with sodium in liquid ammoiua affords excellent yields of Na4[Mo(CO)4] , which can be isolated as a pyrophoric yellow orange powder. In this compound, molybdenum shows its lowest formal oxidation state as evidenced by the very low value of v(CO) 1471 cm . ... 

Although OY//76 -Mo(N2)2(Ph2PCH2CH2PPh2)2 was originally prepared by the route employing molybdenum(III) acetylacetonate and triethylaluminum, the procedure described above is preferable because handling of pyrophoric triethylaluminum needs special caution and the yield is not very high (13%) [58]. 

While useful precursors for the deposition of tungsten and molybdenum are commercially available [i.e. W(CO)e and Mo(CO)6], the standard precursor for silicon (SiDi) has some disadvantages (toxic, pyrophoric). Cyclopentadienyl-substituted silanes have proven to be an easy-to-handle alternative [3]. In this work (CsMe5)Si2H5 and (C5Me4H)SiH3 are used to prepare multilayers and to compare the abilities of both precursors under hot-filament CVD conditions. 

Hexacarbonylmolybdenum was synthesized in low yields by L. Mond by the reaction of pyrophoric molybdenum with carbon monoxide. Presently, it is prepared by carbonylation of M0CI5, molybdic acid, molybdenum sulfide, and other molybdenum compounds. The following reducing agents may be employed Mg, Al, Na, Zn, Fe, Grignard reagents, aluminum organometallic compounds, etc. Sometimes such syntheses involve dry methods whereby no solvent is used. However, most commonly. 

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