Photoionization and dynamic solvation of the excited states of 7-azaindole
Date
Authors
Major Professor
Advisor
Committee Member
Journal Title
Journal ISSN
Volume Title
Publisher
Authors
Research Projects
Organizational Units
Journal Issue
Is Version Of
Versions
Series
Department
Abstract
The excited-state photophysics of the biological probe, 7-azaindole, are examined in water and methanol. Electrons in a presolvated state absorbing in the infrared appear within the excitation pulse width of 130 fs. 330 i 100 fs is required for the presolvated electron to achieve the spectrum characteristic of the completely solvated electron. An excited-state transient absorbance decays in -350 fs for 7-azaindole and its methylated analog, N1-methyl-7-azaindole (1M7AI), in the region 400-450 nm in water and methanol. The instantaneous appearance of the electron in the infrared is attributed to the decay of the lLb excited-state that overlaps the 'La excited state of 7-azaindole. The rapid decay of the excited-state transient absorbance is attributed to preferential, dynamic solvation of the 'La state. 7-Azaindole thus provides an interesting example of a molecule whose excited state is continuously and dynamically solvated but which also produces a species, e,,-, whose solvation appears to occur in a stepwise process.
Comments
Reprinted (adapted) with permission from Journal of Physical Chemistry 97 (1993): 5046, doi: 10.1021/j100121a032. Copyright 1993 American Chemical Society.