Aggregation-induced enhanced emission AIEE

Keywords Aggregation-induced enhanced emission (AIEE) Fluorescent organic nanoparticles Ion-association method Organic dye nanoparticles Reprecipitation method Restriction of intramolecular rotation Size-dependent optical properties... 

A self-assembled chitosan polymeric nanoparticle conjugated with fluorescent stilbene derivatives that exhibit aggregation-induced enhanced emission (AIEE) in vivo was reported by Lim et al. The AIEE phenomenon occnrs in a special class of dyes that have lower flnorescence in solution, but in a concentrated environment (snch as when encapsnlated in a nanoparticle or vesicle), the dyes show a marked enhancement in emission intensity, in contrast to common organic dyes. Dipolar tricyanostilbene derivatives... 

The other key point is that the recognition event should then produce differences in the fluorescence properties of the sensor molecule in the presence of the two enantiomers of the analyte. Several mechanisms can be used to generate the fluorescence response (Figs. 2 and 11) by changing the electronic properties and the conformation of the sensor. Aggregation induced emission enhancement (AIEE) [49] was recently shown to be able to generate an enantioselective fluorescence response. Special optical techniques such as circularly polarized luminescence (CPL) are now available to detect enantioselective interactions occurring in the excited state or in the second coordination-sphere interactions [49]. 

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