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Thelem of1B-TPA, 2B-TPAand3B-TPAwere 467, 461 and 456 nm in CH, and 519, 527 and 529 nm in DMSO, respectively. Compared with thelin CH solutions, the lvalues in DMSO solutions red-shifted by 52, 66 and 73 nm for1B-TPA, 2B-TPAand3B-TPA, respectively. The fluorescent images of 2B-TPAdissolved in different solvents taken under irradiation at 365 nm are shown in Fig. 6. As can be seen, the fluorescence colors completely differ from each other. Thus, the emission properties of this group of molecules highly depend on the solvent polarity.

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