Polycondensation of a Perylene Bisimide Derivative and L-Malic Acid as Water-Soluble Conjugates for Fluorescent Labeling of Live Mammalian Cells.

In contrast to their UV spectra, the inset of Figure 2 b shows that the fluorescent intensity of PBI–PMA first increases linearly with the concentration from 0.078 to 5.0 mg·mL −1 , and then it shows a decreasing trend within the concentration range of 5.0 to 20 mg·mL −1 .

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