Van Der Waals versus Hydrogen-Bonding in Complexes of Indole with Argon, Water, and Benzene by Mass-Analyzed Pulsed Field Threshold Ionization

Autor:	and Th.L. Grebner, H. J. Neusser, J. E. Braun
Rok vydání:	1998
Předmět:	Chemistry Hydrogen bond Van der Waals strain Ionic bonding Dissociation (chemistry) symbols.namesake Ionization symbols Physical chemistry Physical and Theoretical Chemistry Atomic physics Ionization energy van der Waals force Ground state
Zdroj:	The Journal of Physical Chemistry A. 102:3273-3278
ISSN:	1520-5215 1089-5639
Popis:	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.
Databáze:	OpenAIRE
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