Geometries and electronic structures of (2,4-dimethyl-η5-pentadienyl)Mn(CO)n(PMe3)3-n compounds

INOR 219

M. Angeles Paz-Sandoval, mpaz@cinvestav.mx1, Jose Ignacio de la Cruz-Cruz, jdelacruzc321@ipn.mx1, S. Asha Rajapakshe, rajapaks@email.arizona.edu2, Brenda Astrid Paz-Michel, bpaz@cinvestav.mx1, Patricia Juarez-Saavedra1, and Dennis L. Lichtenberger, dlichten@u.arizona.edu2. (1) Departamento de Química, Cinvestav, Av. I.P.N. 2508 esq. Ticomán. Col. San Pedro Zacatenco, Mexico City, Mexico, (2) Department of Chemistry, The University of Arizona, 1306 E. University Blvd., Tucson, AZ 85721
Molecules of the type, (η5-pentadienyl)Mn(CO)3 and (2,4-dimethyl-η5-pentadienyl)Mn(CO)n(PMe3)3-n (n = 3, 2, 1) offer an opportunity to examine fundamental principles of the interactions between metals and pentadienyl ligands (Pdl) compared to the well-developed chemistry of metal-cyclopentadienyl (Cp) complexes as a function of electron richness at the metal center. Photoelectron spectra of these molecules indicate that the systematic replacement of carbonyl ligands by phosphines and ring methylation influence both the metal- and ligand-based ionizations. It is found that the Pdl ligand is both a better donor and a better acceptor ligand compared to Cp. The electronic (donor and acceptor) capabilities of the Pdl ligand are affected by phosphine substitution. Infrared spectroscopy and crystal structure data indicate a similar trend.

 

General Organometallic Chemistry
7:00 PM-10:00 PM, Sunday, August 19, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Inorganic Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007