Abstract
Ab initio calculations (4-31G basis set at CIS and CIS-MP2 levels) were carried out to investigate the nature of the double proton-transfer process of the 7-azaindole base-pair in both S 0 and S 1 states. The result is in agreement with the stepwise mechanism recently observed for S 1, and reveals a diffuse transition state for the reaction in S 0. The stepwise nature of the phototautomerization originates from a localized electronic excitation in one part of the pair. Compression of the internal hydrogen bonds is crucial for the occurrence of the reaction in both states.
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