Cyclopentadienylmolybdenum tricarbonyl dimer
Encyclopedia
Cyclopentadienylmolybdenum tricarbonyl dimer is the chemical compound
with the formula Cp2Mo2(CO)6, where Cp is C5H5. This a dark red crystal
line solid is air stable in solid form, but decomposes in solution when exposed to air. It is one of the most important and most accessible organomolybdenum compounds, although it has no practical uses.
in hot dicyclopentadiene
. A high-yield route to the dimer involves a two-step, one-pot synthesis
. In the first step Mo(CO)6 is converted in hot CH3CN
to the air-sensitive Mo(CO)3(CH3CN)3.
(bis(2-methoxyethyl)ether) results in decarbonylation, giving the tetracarbonyl, which has a formal triple bond between the Mo centers (dMoMo = 2.448 Å):2Mo2(CO)6 → (C5H5)2Mo2(CO)4 + 2 CO
The resulting cyclopentadienylmolybdenum dicarbonyl dimer in turn binds a variety of substrates across the metal-metal triple bond.
Chemical compound
A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together...
with the formula Cp2Mo2(CO)6, where Cp is C5H5. This a dark red crystal
Crystal
A crystal or crystalline solid is a solid material whose constituent atoms, molecules, or ions are arranged in an orderly repeating pattern extending in all three spatial dimensions. The scientific study of crystals and crystal formation is known as crystallography...
line solid is air stable in solid form, but decomposes in solution when exposed to air. It is one of the most important and most accessible organomolybdenum compounds, although it has no practical uses.
Structure and synthesis
The molecule exists in two rotamers, gauche and anti. The six CO ligands are terminal and the Mo-Mo bond distance is 3.2325 Å. The compound is prepared by treatment of Mo(CO)6Molybdenum hexacarbonyl
Molybdenum hexacarbonyl is the chemical compound with the formula Mo6. This colorless solid, like its chromium and tungsten analogues, is noteworthy as a volatile, air-stable derivative of a metal in its zero oxidation state.-Structure and properties:Mo6 adopts an octahedral geometry consisting...
in hot dicyclopentadiene
Dicyclopentadiene
Dicyclopentadiene, abbreviated DCPD, is a chemical compound with formula C10H12. At room temperature, it is a white crystalline solid with a camphor-like odor. Its energy density is 10,975 Wh/l....
. A high-yield route to the dimer involves a two-step, one-pot synthesis
Chemical synthesis
In chemistry, chemical synthesis is purposeful execution of chemical reactions to get a product, or several products. This happens by physical and chemical manipulations usually involving one or more reactions...
. In the first step Mo(CO)6 is converted in hot CH3CN
Acetonitrile
Acetonitrile is the chemical compound with formula . This colourless liquid is the simplest organic nitrile. It is produced mainly as a byproduct of acrylonitrile manufacture...
to the air-sensitive Mo(CO)3(CH3CN)3.
- Mo(CO)6 + 3 CH3CN → Mo(CO)3(CH3CN)3 + 3 CO
- 2 Mo(CO)3(CH3CN)3 + 2 C5H6 → (C5H5)2Mo2(CO)6 + H2 + 6 CH3CN
Reactions
Thermolysis of this compound in hot solution of diglymeDiglyme
Diglyme, or bis ether, is a solvent with a high boiling point. It is an organic compound which is the dimethyl ether of diethylene glycol. It is a clear, colorless liquid with a slight ether-like odor...
(bis(2-methoxyethyl)ether) results in decarbonylation, giving the tetracarbonyl, which has a formal triple bond between the Mo centers (dMoMo = 2.448 Å):2Mo2(CO)6 → (C5H5)2Mo2(CO)4 + 2 CO
The resulting cyclopentadienylmolybdenum dicarbonyl dimer in turn binds a variety of substrates across the metal-metal triple bond.