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INFRARED-ULTRAVIOLET PHOTOIONIZATION AND DEPLETION SPECTROSCOPY OF AL- AND CU-ETHYLENEDIAMINE COMPLEXES

Aland Cu-ethylenediamine (C N H ) complexes were generated in supersonic molecular beams, and their C-H and N-H stretching modes were measured by resonant infrared-ultraviolet two-photon ionization and depletion spectroscopy. The spectrum of Alethylenediamine displayed three C-H stretching frequencies of 2880, 2936, and 2946 cm , whereas that of Cu-ethylenediamine exhibited five such vibrations with frequencies of 2880, 2921, 2931, 2951, and 2967 cm . In contrast, only two N-H stretches were identified for each of the two complexes, which were 3320 and 3392 cm for Al and 3275 and 3360 cm for Cu. These experimental spectra were compared to the prediction of density functional theory calculations and to the infrared spectrum of the free ligand. From these comparisons, a cyclic bidentate structure was identified for Al-ethylenediamine, and a hydrogen-bonded monodentate structure was determined for the corresponding Cu species. This study was consistent with the previous work of pulsed-field ionization electron spectroscopy of these complexes.