Synthesis and characterization of Pentacarbonylacryloylferrocenetungsten(0) complex

Boğa, Dilek Ayşe
Pentacarbonylacryloylferrocenetungsten(0) complex was synthesized photochemically from hexacarbonyltungsten(0) and acryloyferrocene (acfc). UV irradiation of W(CO)6 in the presence of acryloylferrocene at 10 oC for 4 hours in n-hexane solution generates the W(CO)5(?2-acfc) complex as the sole monosubstitution product of the photolysis, as monitored by FT-IR spectroscopy. The product complex could be isolated from the reaction solution and characterized by IR, Raman, 1H-NMR, 13C-NMR spectroscopies, mass spectrometry and elemental analysis. The complex was found to be unstable in solution and to decompose to the parent W(CO)6 complex and free acryloylferrocene molecule. The instability of the complex makes its isolation as analytically pure substance difficult. In order to stabilize the tungsten-olefin bond, trimethylphosphite was introduced as a donor ligand into the molecule. Thus, a complex containing a donor ligand in addition to the olefinic ligand was prepared starting with W(CO)6, trimethylphosphite, and acryloylferrocene. UV irradiation of W(CO)5[P(OMe)3] with acryloylferrocene in n-hexane solution at room temperature generates W(CO)4[P(OMe)3](?2-acfc), which was isolated from the reaction solution and characterized by IR, 1H-NMR, 13C-NMR spectroscopies and mass spectrometry. The complex was found to have a cis arrangement of four CO groups in the pseudo-octahedral geometry. However, the cis-W(CO)4[P(OMe)3](?2-acfc) complex was found to be less stable than W(CO)5(?2-acfc).


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Citation Formats
D. A. Boğa, “Synthesis and characterization of Pentacarbonylacryloylferrocenetungsten(0) complex,” M.S. - Master of Science, Middle East Technical University, 2006.