Aggregation-caused quenching

Aggregation normally quenches light emission what is the cause for this abnormal AIE phenomenon To address this question, we designed and carried out more experiments. When a dilute dioxane solution of 3 (lOjiM) is cooled, the intensity of its PL spectrum is progressively increased in a nonlinear fashion (Fig. 6A). When cooled from room temperature to below the melting point (11, Z°C) of the solvent, the liquid solution changes to a solid glass. The intramolecular rotations or... 

It has been important to determine if the neoxanthin distortion signature could be detected during the nonphotochemical quenching in vivo. Resonance Raman measurements on leaves and chlo-roplasts of various Arabidopsis mutants have revealed a small increase in the 950 cm 1 region. The relationship between the amplitude of this transition and the amount of NPQ suggests that the LHCII aggregation may be the sole cause of the protective chlorophyll fluorescence quenching in vivo (Ruban et al., 2007). 

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