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Two asymmetric perylene bisimide dyes, 1-cyano-7-piperidinylperylene bisimide (1) and 1-bromo-7-piperidinylperylene bisimide (2), were synthesized and fully characterized. These molecules undergo an excited-state intramolecular electron transfer reaction, resulting in a unique charge transfer emission, of which the peak wavelength exhibits strong solvatochromism. They show both larger ground-state...
Three D–π–A type pyridinium salts based on dipicolinate were synthesized. Compared to the corresponding neutral chromophores, enhanced two-photon absorption activity and water solubility were obtained. When measured by the Z-scan technique at 800 nm, the three molecules display considerably high values of two-photon absorption cross-section. The two-photon absorption cross-section values were found...
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