Increasing the efficiency of the ring-opening reaction of photochromic indolylfulgides by optical pre-excitation

Chemical Physics Letters, 2010, 489, 175 - 80 published on 09.04.2010
Chemical Physics Letters, online article

For three indolylfulgides the quantum efficiency of the ring-opening reaction upon pre-excitation is investigated in a multipulse experiment. The quantum efficiency grows by factor of up to 3.4, when the pre-excitation pulse immediately precedes the excitation process. The change in quantum efficiency after pre-excitation is discussed as a function of reaction time, steady-state quantum efficiency and energetic barriers in the excited electronic state. The observed differences can be explained by the molecular properties of the investigated indolylfulgides

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