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- W2019916643 abstract "It is shown that the direct precursor for the formation of a photochrome in Schiff bases is a “twisted” geometry S1 state of a keto tautomer in which the O⋯N–H hydrogen bond is broken. In photochromic Schiff bases this state is close in energy to the ππ* state of the cis-ketone obtained from the initially optically excited enol species by an ultrafast excited-state proton transfer, in particular, in N-salicylidene-α-methylbenzylamine (SMB), it lies within 1 kcal/mol from the ππ* state of cis-ketone and ∼16 kcal/mol below the initial ππ* state of enol. The excited-state proton transfer in SMB is predicted to take ∼15 fs and to be nearly barrierless. It is also shown that the initial ππ* state of enol can decay via competing route to a twisted geometry nNπ* state of enol with the energy ∼20 kcal/mol below that state." @default.
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- W2019916643 date "2001-11-08" @default.
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- W2019916643 title "Theoretical study of photochromism of N-salicylidene-α-methylbenzylamine" @default.
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