π-Aggregation-free, fused perylene pentamers: synthesis, narrowband far-red to near-infrared emission, and chiroptical properties.

36 Time-resolved fluorescence measurements reveal a clear trend of faster decay with increasing π-extension: the lifetimes decrease from 6.3 ns (1a- rac ) and 6.2 ns (1a- meso ) to 4.3 ns (1b) and 3.3 ns (1c), with 1d showing a slightly longer lifetime of 3.9 ns (Fig.

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