Scandium (Sc) complexes of fluorobenzene (C6 H5 F), toluene (C6 H5 CH3), phenol (C6 H5 OH), and benzonitrile (C6 H5 CN) are produced in a laser-vaporization molecular beam source. These complexes are studied with pulsed-field-ionization zero-electron-kinetic-energy (ZEKE) spectroscopy and density functional theory calculations. Adiabatic ionization energies and low-frequency metal-ligand and ligand-based vibrational modes are measured from the ZEKE spectra. Metal binding sites and strengths and electronic states are obtained by comparing the ZEKE spectra with the theoretical calculations. The ionization energies of Sc- C6 H5 X (X=F, CH3, OH, and CN) follow the trend of CNFOH CH3, whereas the bond energies are in the order of CN CH3 ∼OH F. The metal-ligand stretching frequency of Sc+ - C6 H5 CN is nearly twice as those of the other three complexes. All neutral complexes are in low-spin doublet ground states and singly-charged cations are in singlet states. The preferred Sc binding site in these complexes are the phenyl ring with X=F, CH3, and OH and the nitrile group with CN. For the phenol complex, two rotational conformers are identified in different OH orientations.
|Journal||Journal of Chemical Physics|
|State||Published - 2009|
Bibliographical noteFunding Information:
We are grateful for the financial support from the Experimental Physical Chemistry Program of the National Science Foundation. We also acknowledge additional support from donors of the Petroleum Research Fund of the American Chemical Society and Kentucky Science and Engineering Foundation.
ASJC Scopus subject areas
- Physics and Astronomy (all)
- Physical and Theoretical Chemistry