Ir-tripod hydroformylation catalysts

Tripod ligands are known to stabilize various oxidation states of organometallic complexes. This may be an important aspect of catalytic applications, since the catalyst's activity might be controlled by electron transfers. Ir-tripod complexes catalyze hydrogenations and hydroformylations.
Electrochemical one- and two-electron oxidation induces the formation of dimers and decarboxylated product complexes. The reaction mechanism corresponds to a complicated mesh scheme. The dimer formation is a possible reason for the catalyst's deactivation.

Coworkers in this project:

Silke Buchmann

We closely cooperate with the group of

Hermann A. Mayer.

We acknowledge funding of this project by the Deutsche Forschungsgemeinschaft, Bonn - Bad Godesberg.

Publications from this project:

S. Buchmann, H.A. Mayer, B. Speiser, M. Seiler, M.P. Feth, H. Bertagnolli, S. Steinbrecher und E. Plies, Electrochim. Acta, 48, 2725 - 2737 (2003); Electrochemistry of Transition Metal Complex Catalysts. Part 9. One- and Two-Electron Oxidation of Iridium Complexes with Cyclohexane-Derived Tripod Phosphine Ligands; Erratum: Electrochim. Acta, 48, 4319 - 4320 (2003).

S. Buchmann, H.A. Mayer, B. Speiser, M. Seiler, H. Bertagnolli, S. Steinbrecher und E. Plies, Electrochim. Acta, 46, 3207 - 3217 (2001); Electrochemistry of Transition Metal Complex Catalysts. Part 8. One-Electron Oxidation of an Iridium Complex with a Cyclohexane-Derived Tripod Phosphine Ligand -- Cyclic Voltammetry and Preparative Electrolysis

M.P. Feth, U. Reinöhl, T.S. Ertl, M. Seiler, H. Bertagnolli, S. Maier, B. Speiser und H.A. Mayer, HASYLAB Ann. Rep. 780 - 781 (1999); EXAFS Investigation of Organometallic Iridium Complexes.