Table of Contents
Laser Chemistry
Volume 15, Issue 2-4, Pages 167-181

Spectroscopic Study of Hydrogen Bonded7-Azaindole Clusters

1Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223, Japan
2RIKEN, The Institute of Physical and Chemical Research, Wako, Saitama 351-01, Japan
3Department of Chemistry, Faculty of Science, Kobe University, Nada-ku, Kobe 657, Japan
4Department of Chemistry, College of Liberal Arts and Sciences, Kyoto University, Sakyo-ku, Kyoto 606, Japan

Received 18 April 1994

Copyright © 1995 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The geometric structures of 7-azaindole (7-AzI) and its dimer were investigated by laser-induced fluorescence (LIF). The rotationally resolved LIF spectrum (resolution: ∼0.00003 cm-1 of 7-AzI monomer shows that (i) rotational constants are A′′ 0.13082(5), B′′ = 0.05677(2), C′′ = 0.03970(1), A′ = 0.12468(5), B′ = 0.056752(2), and C′ = 0.03911(1), and (ii) the transition dipole moment direction is tilted at an angle of ± 21(5) degrees with respect to a axis. The LIF spectrum (resolution: ∼0.06 cm-1) of the nonreactive 7-AzI dimer suggests there are three possibilities for the geometric structure, having “single bonded”, “T-shaped”, and “non-planar” structures.

The ionization energy of 7-AzI was determined to be 8.1171(5) eV by using pulsed-field ionization photoelectron spectroscopy (PFI-PES). Several vibronic bands of 7-AzI cation were observed and compared with those of neutral 7-AzI in the S0 and S1 states. The electron binding energies of 7-AzI cluster anions (2 ≤ n ≤ 5) were determined by photoelectron spectroscopy.