![]() | This article may be too technical for most readers to understand.(March 2024) |
A metal-formaldehyde complex is a coordination complex in which a formaldehyde ligand has two bonds to the metal atom(s) (η2-CH2O). This type of ligand has been reported in both monometallic and bimetallic complexes.
Metal-formaldehyde complexes have been reported for tungsten (W), osmium (Os), [1] vanadium (V), [2] rhenium (Re), [3] zirconium (Zr), [4] [5] [6] ruthenium (Ru), [7] and niobium (Nb). [8]
In 1984, Green and coworkers reported the yellow crystalline solid W(PMe3)4(η2-CH2O)H2. It was the result of the addition of methanol to W(PMe3)4(η2-CH2PMe2)H.
W(PMe3)4(η2-CH2O)H2 can be hydrogenated to give W(PMe3)4(MeO)H3, and then further hydrogenated to reform methanol and generate W(PMe3)4H4. [9] In 1986, Green and Parkin demonstrated further reactivities of W(PMe3)4(η2-CH2O)H2. Upon addition of CO or CO2, W(PMe3)4(η2-CH2O)H2 produces fac-W(PMe3)3(CO)3 and W(PMe3)4(κ2-O2CO)H2, respectively, much like its precursor.
W(PMe3)4(η2-CH2O)H2 also reacts with buta-1,3-diene to give W(PMe3)3(η2-CH2O)(η-C4H6). [10]
W(PMe3)4(η2-CH2O)H2 can also be used as a route to further oxometallacycles by the addition of ethylene and rapid cooling to –80°C. The resultant green-colored crystals are composed of W(OCH2CH2CH2)(PMe3)2(η2-C2H4)2, with either both ethylene ligands on the equatorial plane or the ethylene ligand cis- to the ligating oxygen in the axial direction. Further reaction with ethylene produces trans-W(PMe3)4(η2-C2H4)2 and W(PMe3)4(CO)H2. [10]
![]() | This article may be too technical for most readers to understand.(March 2024) |
A metal-formaldehyde complex is a coordination complex in which a formaldehyde ligand has two bonds to the metal atom(s) (η2-CH2O). This type of ligand has been reported in both monometallic and bimetallic complexes.
Metal-formaldehyde complexes have been reported for tungsten (W), osmium (Os), [1] vanadium (V), [2] rhenium (Re), [3] zirconium (Zr), [4] [5] [6] ruthenium (Ru), [7] and niobium (Nb). [8]
In 1984, Green and coworkers reported the yellow crystalline solid W(PMe3)4(η2-CH2O)H2. It was the result of the addition of methanol to W(PMe3)4(η2-CH2PMe2)H.
W(PMe3)4(η2-CH2O)H2 can be hydrogenated to give W(PMe3)4(MeO)H3, and then further hydrogenated to reform methanol and generate W(PMe3)4H4. [9] In 1986, Green and Parkin demonstrated further reactivities of W(PMe3)4(η2-CH2O)H2. Upon addition of CO or CO2, W(PMe3)4(η2-CH2O)H2 produces fac-W(PMe3)3(CO)3 and W(PMe3)4(κ2-O2CO)H2, respectively, much like its precursor.
W(PMe3)4(η2-CH2O)H2 also reacts with buta-1,3-diene to give W(PMe3)3(η2-CH2O)(η-C4H6). [10]
W(PMe3)4(η2-CH2O)H2 can also be used as a route to further oxometallacycles by the addition of ethylene and rapid cooling to –80°C. The resultant green-colored crystals are composed of W(OCH2CH2CH2)(PMe3)2(η2-C2H4)2, with either both ethylene ligands on the equatorial plane or the ethylene ligand cis- to the ligating oxygen in the axial direction. Further reaction with ethylene produces trans-W(PMe3)4(η2-C2H4)2 and W(PMe3)4(CO)H2. [10]