Aggregation-Induced Emission: A Simple Strategy to
Improve Chemiluminescence Resonance Energy Transfer
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Abstract
The emergence of aggregation-induced
emission (AIE) has opened
up a new avenue for scientists. There is a great demand for the development
of a new generation chemiluminescence resonance energy transfer (CRET)
acceptors with AIE characteristics due to the aggregation-caused chemiluminescence
(CL) quenching effect commonly observed in the conventional fluorophore
CL acceptors at high concentrations. However, the systematical studies
involving in AIE-amplified CL are still scarce. Herein, it is the
first report that the gold nanocluster aggregates (a type of well-defined
AIE molecules) are used to study their influence on the bis(2,4,6-trichlorophenyl)
oxalate (TCPO)–H<sub>2</sub>O<sub>2</sub> CL reaction. Interestingly,
the AIE molecules in the diluted solution are unable to boost the
CL signal of the TCPO–H<sub>2</sub>O<sub>2</sub> system, but
their aggregates display a strongly enhanced CL emission compared
to their counterparts of fluorophore molecules, thanks to the unique
AIE effect of gold nanoclusters. In comparison to rhodamine B with
the aid of an imidazole catalyst, the detection limit of the gold
nanocluster aggregate-amplified CL probe for H<sub>2</sub>O<sub>2</sub> (S/N = 3) is low in the absence of any catalyst. Finally, the other
two typical AIE molecules, Au(I)–thiolate complexes and 9,10-bis[4-(3-sulfonatopropoxyl)-styryl]anthracene
(BSPSA), are investigated to verify the generality of the AIE molecule-amplified
CL emissions. These results demonstrate effective access to highly
fluorescent AIE molecules with practical applications in avoiding
the aggregation-induced CL quenching at high concentrations, which
can be expected to provide a novel and sensitive platform for the
CL amplified detection