ELECTRONIC SPECTRA OF METAL-DILIGAND COMPLEXES: $Cu(NH_{3})_{2}$ AND $Cu(ND_{3})_{2}$

Author Institution: Department of Chemistry, University of KentuckyZero 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 $Cu(NH_{3})_{2}$ the metal ion -ligand symmetric stretching and bending frequencies were measured to be 436 and $139 cm^{-1}$, whereas the $NH_{3}$ torsion was determined as $32 cm^{-1}$