Journal of Chemical Physics, Vol.115, No.10, 4565-4572, 2001
Zero electron kinetic energy photoelectron spectroscopy of weakly bound In-NH2CH3, In-NH(CH3)(2), and In-N(CH3)(3) complexes
Single-photon pulsed field ionization-zero electron kinetic energy photoelectron spectroscopy has been used to study the indium-methylamine complexes. The photoelectron spectra have been assigned using density functional theory and Franck-Condon calculations. The spectral assignments identify the symmetric In+-N stretch mode for In+-NH2CH3 (259 cm(-1)), In+-NH(CH3)(2) (200 cm(-1)), and In+-N(CH3)(3) (158 cm(-1)); In-N stretch for In-N(CH3)(3) (110 cm(-1)); In+-N-C bend for In+-NH2CH3 (110 cm(-1)) and In+-NH(CH3)(2) (120 cm(-1)); In-N-C bend for In-NH2CH3 (91 cm(-1)) and In-NH(CH3)(2) (106 cm(-1)); and In+-N-H bend for In+-NH(CH3)(2) (324 cm(-1)). Methyl substitutions for hydrogen atoms greatly influence the indium-nitrogen stretch forces and ionization potentials of the complexes. The indium-amine binding in these complexes includes orbital interaction and electrostatic forces.