10min:
ELECTRONIC SPECTRA OF METAL-DILIGAND COMPLEXES: Cu(NH3)2 AND Cu(ND3)2.

SHENGGANG LI, BRADFORD R. SOHNLEIN AND DONG-SHENG YANG, Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055.

Zero electron kinetic energy (ZEKE) photoelectron spectroscopy was used to study the electronic spectra of metal-diammonia and its deuterated species. The adiabatic ionization potential of the copper complex was measured to be 29532 cm-1, a shift of more than a factor of two relative to that of the copper atom (62317 cm-1); deuteration further decreased the ionization potential of the complex by 219 cm-1 due to the shift of the zero point vibration energies. Furthermore, the ZEKE spectra revealed the copper-ammonia vibrations and ammonia torsion. For example, in Cu(NH3)2 the metal ion -ligand symmetric stretching and bending frequencies were measured to be 436 and 139 cm-1, whereas the NH3 torsion was determined as 32 cm-1.