Star-shaped D-π-A compounds with a 1, 3, 5-triazine core and N-aryl chromophore substituted fluorene arms: Synthesis, aggregation induced emission and two-photon absorption. (February 2017)

• Record Type: Journal Article
• Authors: Liu, Rui; Shu, Mingliang; Hu, Jinyang; Zhu, Senqiang; Shi, Hong; Zhu, Hongjun
• Is Part Of: Dyes and pigments. Volume 137(2017)
• Page Start: 174
• Page End: 181
• Publication Date: 2017-02
• Subjects: Triazine -- N-aryl chromophore -- Synthesis -- Photophysics -- Aggregation induced emission -- Two-photon absorption; Dyes and dyeing -- Periodicals; Pigments -- Periodicals; 667.2
• DOI: 10.1016/j.dyepig.2016.10.015
• Languages: English
• ISSNs: 0143-7208

Abstract

Abstract: Three star-shaped D-π-A compounds with a 1, 3, 5-triazine core and N -aryl chromophore (3, 6-di- tert -butylcarbazole, phenoxazine and phenothiazine) substituted fluorene arms were designed and synthesized. Their photophysical properties were investigated systematically via spectroscopic and theoretical methods. All compounds exhibit strong 1 π–π* transitions in the UV region and intense 1 π–π*/intramolecular charge transfer ( 1 ICT) absorption bands in the UV–vis region. Bathochromic shifts of the 1 ICT bands were caused by the electron-donating N -aryl chromophores. All compounds exhibit aggregation induced emission properties in a solvent, and relatively high quantum efficiency in solid-states ( Φ = 10%–20%). Moreover, these compounds show two-photon absorption (TPA) properties due to their good planarity and large π-conjugation. The largest TPA cross section value reaches up to 5000 GM at 800 nm. The multifunctional properties make these compounds potential candidates for application in organic light-emitting materials and two-photon bioimaging. Highlights: Star-shaped 1, 3, 5-triazine bearing N -aryl chromophore were synthesized. All compounds exhibit two-photon absorption and aggregation induced emission. Their values of TPA cross sections are ranged from 3800 GM to 5000 GM.