Anion photoelectron spectroscopy of deprotonated indole and indoline

被引:6
作者
Nelson, Daniel J. [2 ]
Oliveira, Allan M.
Lineberger, W. Carl [1 ]
机构
[1] Univ Colorado Boulder, JILA, 440 UCB, Boulder, CO 80309 USA
[2] Leybold Inc, 5700 Mellon Rd, Export, PA 15632 USA
关键词
GAS-PHASE; ULTRAVIOLET SPECTROSCOPY; ANGULAR-DISTRIBUTIONS; ELECTRONIC-STRUCTURE; MICROWAVE-SPECTRUM; BINDING-ENERGIES; NEGATIVE-IONS; ABSORPTION; TRYPTOPHAN; CLUSTERS;
D O I
10.1063/1.5003978
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Anion photoelectron spectra of deprotonated indole have been obtained utilizing several photon energies. The slow electron velocity-map imaging spectrum of indolide allows for the determination of the electron affinity (EA) of indolyl, 2.4315 +/- 0.0017 eV. The equilibrium geometry of indolide was shown to minimally distort upon photodetachment with only ring distortion vibrational modes of A 0 symmetry becoming significantly excited. Photoelectron spectra of indolide accessing the electronic ground state of indolyl displayed a photon energy dependence due to electron autodetachment. Combining the EA of indolyl with the previous work studying the dissociation energy of H-indolyl allows for a new independent measure of Delta H-acid(0K)degrees(N-H)(indole) <= 348.7 kcal/mol, which improves the previous measurement of the gas phase acidity. The anion photoelectron spectrum of deprotonated indoline consisted of a featureless broad band extending from similar to 1.3 eV to 1.7 eV electron binding energy. The congested nature of the spectrum is likely due to the presence of multiple isomers of deprotonated indoline, including ring-opened structures. Published by AIP Publishing.
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页数:8
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