Bis(cyclooctadiene)nickel(0) is the organonickel compound with the formula Ni(C8H12)2, also written Ni(cod)2. It is a diamagnetic coordination complex featuring tetrahedral nickel(0) bound to the alkene groups in two 1,5-cyclooctadiene ligands. This highly air-sensitive yellow solid is a common source of Ni(0) in chemical synthesis.[1]
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Other names
nickel biscod, Ni(COD)2
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3D model (JSmol)
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ECHA InfoCard | 100.013.702 |
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PubChem CID
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UN number | 1325 |
CompTox Dashboard (EPA)
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Properties | |
C16H24Ni | |
Molar mass | 275.06 g/mol |
Appearance | Yellow solid |
Melting point | 60 °C (140 °F; 333 K) (N2, decomposes) |
Solubility | soluble in benzene, tetrahydrofuran, toluene, diethyl ether, dimethylformamide |
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Danger | |
H228, H317, H334, H350, H351 | |
P201, P202, P210, P240, P241, P261, P272, P280, P281, P285, P302+P352, P304+P341, P308+P313, P321, P333+P313, P342+P311, P363, P370+P378, P405, P501 | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references
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The complex is prepared by reduction of anhydrous nickel(II) acetylacetonate in the presence of the diolefin:
Ni(cod)2 is moderately soluble in several organic solvents.[2][3]
If exposed to air, the solid oxidizes in a few minutes to nickel(II) oxide.[4] As a result, this compound is generally handled in a glovebox.[5]
The reactivity of Ni(cod)2 has been extensively examined. One or both 1,5-cyclooctadiene ligands are readily displaced by phosphines, phosphites, bipyridine, and isocyanides. [6]
Oxidation gives the highly reactive monocation, which can be isolated when using weakly coordinating anions:[7]
Of its many catalytic reactions,[5] Ni(cod)2 in the presence of phosphine ligands catalyzes the demethoxylation of anisoles by hydrosilanes:[8]