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Structures and electron affinities of indole–(water)N clusters

2000; American Institute of Physics; Volume: 112; Issue: 8 Linguagem: Inglês

10.1063/1.480938

1520-9032

Sophie Carles, C. Desfrançois, J. P. Schermann, Dayle M. A. Smith, L. Adamowicz,

Advanced Chemical Physics Studies

Rydberg electron transfer spectroscopy (RET) has been used to determine the dipole-bound electron affinity of the indole molecule, and the value of 3 meV was obtained. RET has also been employed to study [indole–(water)N]− cluster anions and the results have been interpreted with the help of ab initio calculations. It has been shown that for N=1 and 2 only dipole-bound anions are formed and that the electron attachment induces large amplitude motions in these systems. [Indole–(water)N]− anions with N=3 and 4 have not been observed. This finding for N=3 is consistent with a low theoretically predicted dipole moment of the neutral indole–(water)3 complex, which is insufficient for the formation of a stable dipole-bound anion. Above N=5, RET experiments showed formation of valence [indole–(water)N]− anions. From the observed size threshold for the formation of these anions, the negative value of the valence electron affinity of indole equal to −1.03±0.05 meV was deduced.