Abstract
Four newly synthesized pyromellitic diimide-based fluorescent dyes with different aryl groups were first reported. All pyromellitic diimide (PMDI) derivatives were firstly displayed prominent aggregation-induced emission (AIE) properties. Additionally, the tunable fluorescence of PMDI derivatives were achieved by the varied substituent groups linked on the PMDI skeleton. With the enlarged sizes of isolation groups, aggregation-induced emission migration in the direction of red waves, as the result of the efficient inhibition of π-π stacking by the larger substituent groups. Furthermore, the mechanofluorochromic (MFC) performance of these PMDI derivatives could be tuned by different sized of the substituent groups. Interestingly, PMDI-ESCz, PMDI-PSCz and PMDI-DSCz exhibited reversible mechanofluorochromic performances, but no mechanochromism phenomenon was found for PMDI-In. These results exhibited that substituent groups had significant influence on their AIE and MFC properties.
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