Abstract
By using the technique of mass-analyzed threshold ionization spectroscopy, we were able to measure ionization energies of indole−Ar (62505 cm-1), indole−H2O (59433 cm-1), and the indole−benzene (59833 cm-1) complexes, as well as their dissociation energies in the cationic ground state. The dissociation energies in the neutral ground state are calculated from the experimental data. The ionic E0 = 537 ± 10 cm-1 and neutral dissociation energy D0 = 451 ± 15 cm-1 of the indole−Ar complex are much smaller than those of the indole−H2O complex; E0 = 4790 ± 10 cm-1, D0 = 1632 ± 15 cm-1 and of the indole−C6H6 complex: E0 = 4581 ± 10 cm-1, D0 = 1823 ± 15 cm-1. This demonstrates the van der Waals character of the indole−Ar complex and the hydrogen bonding type in indole−water. Furthermore, we conclude that the indole−benzene complex is hydrogen-bonded with the benzene π-cloud serving as electron donator and indole serving as hydrogen donator.
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