Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 130, Issue 26, Pages 8150-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja8022384
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The photoelectron spectral of aqueous imidazole are presented, and the N 1s and C 1s binding energies are assigned aided by density functional theory calculations. The chemical equivalence of a single N 1s photoelectron peak, which results from the delocalization of the positive charge over the molecule as a consequence of the C-v symmetry of the system. In contrast to NMR measurements, the photoemission process is faster than the rapid proton exchange in the aqueous environment, making the pseudoequivalent nitrogens of the neutral state clearly distinguishable with a N 1s binding energy shift of 1.7 eV.
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