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Molybdenum hexacarbonyl is a popular reagent in academic research. [6]One or more CO ligands can be displaced by other ligands. [7] Mo(CO) 6, [Mo(CO) 3 (MeCN) 3], and related derivatives are employed as catalysts in organic synthesis for example, alkyne metathesis and the Pauson–Khand reaction.
W(CO) 6 behaves similarly to the Mo(CO) 6 but tends to form compounds that are kinetically more robust. Cyclopentadienyltungsten tricarbonyl dimer ((C 5 H 5.) 2 W 2 (CO) 6) is produced from W(CO) 6. Treatment of tungsten hexacarbonyl with sodium cyclopentadienide followed by oxidation of the resulting NaW(CO) 3 (C 5 H 5) gives ...
(Mesitylene)molybdenum tricarbonyl arises from the reaction of molybdenum hexacarbonyl with hot mesitylene: [1]. Mo(CO) 6 + (CH 3) 3 C 6 H 3 → Mo(CO) 3 [(CH 3) 3 C 6 H 3] + 3 CO It can also be synthesized, with good yields by displacement of pyridine ligands of the trispyridine complex Mo(CO) 3 (pyridine) 3 in the presence of Lewis acids.
Halogenation of Mo(CO) 6 gives Mo(II) carbonyl halides, which are also versatile precursors. [7] One large collection of compounds have the formula (C 5 R 5 )Mo(CO) 3 X, derived from cyclopentadienylmolybdenum tricarbonyl dimer (X = halide, hydride, alkyl).
2 Mo(CO) 6 + 4 HO 2 CCH 3 → Mo 2 (O 2 CCH 3) 4 + 12 CO + 2 H 2. Trinuclear clusters are byproducts. [7] The reaction of HO 2 CCH 3 and Mo(CO) 6 was first investigated by Bannister et al. in 1960. At the time, quadruple metal-metal bonds had not yet been discovered, so these authors proposed that Mo(O 2 CCH 3) 2 was tetrahedral.
The six CO ligands are terminal and the Mo-Mo bond distance is 3.2325 Å. [2] The compound is prepared by treatment of molybdenum hexacarbonyl with sodium cyclopentadienide followed by oxidation of the resulting NaMo(CO) 3 (C 5 H 5). [3] Other methods have been developed starting with Mo(CO) 3 (CH 3 CN) 3 instead of Mo(CO) 6. [4]
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The standard atomic weight takes into account the isotopic distribution of the element in a given sample (usually assumed to be "normal"). For example, water has a molar mass of 18.0153(3) g/mol, but individual water molecules have molecular masses which range between 18.010 564 6863 (15) Da (1 H 2 16 O) and 22.027 7364 (9) Da (2 H 2 18 O).