IR-UV PHOTOIONIZATION AND DEPLETION SPECTROSCOPY OF Al- AND Cu-ETHYLENEDIAMINE COMPLEXES Yuxiu Lei, Jung Sup Lee, and Dong-Sheng Yang Department of Chemistry, University of Kentucky, Lexington, KY

Motivations Probe N-H and C-H stretch modes Structural identification (compared to ZEKE results) Larger clusters (multiple-ligand and multiple-metal)

Al-(Ethylenediamine) Cu-(Ethylenediamine) Ethylenediamine (en) Previous ZEKE Studies 1. Xu Wang and Dong-Sheng Yang, J. Phys. Chem. A, 2004, 108, Shenggang Li, Jason F. Fuller, Xu Wang, Bradford R. Sohnlein, Paragranjita Bhowmik, and Dong-Sheng Yang J. Chem. Phys., 2004, 121, 7692.

IR-UV Experimental Schemes IE ν = 1 ν = ns ν = 1 ν = ns ν=0 Resonant 2-photon ionization(R2PI)ZEKE dip IR UV IR

R2PI Spectra of Cu- and Al-en Cu-en Al-en N-HC-H

A. Diot et T. Theophanides, Canadian Journal of Spectroscopy, 17, 1972, IR Spectrum of Ethylenediamine

Experimental and Simulated IR Spectra of the Ligand IR (cm -1 )

Cu-en en Al-en C-HN-H Comparison of Complexes with Ligand

Al-en N-H bands

Al-en C-H bands

Cu-en N-H bands

Cu-en C-H bands

2950, C-H stretch 2960, C-H stretch 1351, C-H bend1598, N-H bend Fermi resonance: 2960 ≈ 2950 ≈ = 2949

Cu-en C-H bands

Cu-en C-H bands

Cu-en C-H bands

R2PI and ZEKE Dip R2PI ZEKE Dip

Conclusions and Future works ν = 1 ν = 0 ν + = 0 ν + = 1 Measurement of N-H and C-H frequencies for neutral complexes Consistent with ZEKE results New schemes for ion frequency measurements Multiple-ligand and multiple-metal complexes