Photothermal conversion performance of perylene diimide radical anion salts modified with tunable moieties
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Among photothermal materials, perylene diimide radical anions were promising organic candidates with intense and characteristic near-infrared (NIR) absorption bands and non-fluorescence. Herein, two isolable and ambient stable bay-substituted perylene diimide radical anion salts, namely DBrPDI radical anion salt and TPPDI radical anion salt, were facilely prepared and confirmed by using a very thorough analysis based on the data from UV–Vis/NIR, FL, FTIR, EPR and NMR spectra. Subsequently, two radical anion salts were applied as photothermal conversion agents. DBrPDI radical anion salt exhibited high-performance photothermal conversion in DMF solutions, however a decline in aqueous solution. TPPDI radical anion salt with bulky moieties onto the PDI cores and amine position gave substantial evidence that the photothermal properties could be optimized and enhanced in aqueous solution by modulating the chemical structure of the photothermal conversion agent.
The authors acknowledge financial support from the National Natural Science Foundation of China (Nos: 51472214, 51173155) and the Natural Science Foundation of Hebei Province (No: E2017203247). We also show our gratitude to Prof. Leilei Tian (South University of Science and Technology of China, Shenzhen) for photothermal conversion measurement.
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Conflict of interest
The authors declare there is no conflict of interest.
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