Mass analyzed threshold ionization spectroscopy of N-methylaniline, N-ethylaniline, and N,N-dimethylaniline cations: Influence of N-alkyl substitution on the ionization energy and molecular vibration
作者： Rong Hu Wu , Jung Lee Lin , Jieli Lin , Shih Chang Yang , Wen Bih Tzeng
DOI: 10.1063/1.1553467
关键词: Ion 、 Ionization 、 Ionization energy 、 Alkyl 、 Analytical chemistry 、 N-Methylaniline 、 Molecular vibration 、 Chemical ionization 、 Chemistry 、 Ionic bonding 、 Physical and Theoretical Chemistry 、 General Physics and Astronomy
摘要: We have applied two-color resonant two-photon mass analyzed threshold ionization spectroscopy to investigate some ionic properties of N-alkylanilines. The respective adiabatic energies N-methylaniline (NMA), N-ethylaniline (NEA), and N,N-dimethylaniline (DMA) are determined be 59 822, 59 204, 58 018 cm−1 with an uncertainty about 5 cm−1. This indicates that the longer alkyl chain gives rise a larger redshift in IE due stronger interaction between group nitrogen atom state. Because increase electron density around neutral species, DMA is lower than NMA. In addition, N-alkyl substitution also influences frequency internal motion cations. However, variation dependent upon vibrational pattern extent coupling ring vibrations.
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