Synthesis,Photophysical Properties of Tribranched Chromophores Based on 1,3,5‐Triazine Core and Different Electro‐donating End‐groups |
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| Authors: | Li Liu Wei Huang Jieping Shi Changgui Lü Yiping Cui Guo‐Yuan Lu |
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| Affiliation: | 1. Department of Chemistry, State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing, jiangsu 210093, China;2. Advanced Photonics Center, Southeast University, Nanjing, Jiangsu 210096, China |
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| Abstract: | Three two‐photon absorption (TPA) tribranched chromophores were successfully prepared, in which 1,3,5‐triazine is been as electron deficient core, 1,4‐phenylenedivinylene as conjugated bridge, 3,4‐ethylenedioxythiophene (EDOT) ( T1 ), N‐methylpyrrole ( T2 ) or triphenylamine ( T3 ) as electron‐donating end‐groups. Their photophysical properties were studied by absorption, one‐ and two‐photon fluorescence and TPA cross‐section determination. The nonlinear transmission (NLT) measurement in femtoseconds (fs) regime at 800 nm indicates that TPA cross‐section (2 values of T1 , T2 and T3 with extended Π‐conjugated bridge are much larger than the corresponding chromophore T4 with a short length bridge, and TPA cross‐section of T1 with end‐groups EDOT exhibits a remarkable enhancement compared with T2 and T3 having the same length Π‐system. The chromophores T1 , T2 and T3 show also remarkable up‐converted luminescence and optical limiting activity. |
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| Keywords: | chromophore triazine 3,4‐ethylenedioxythiophene two‐photon absorption photophysics Horner‐Wadsworth‐Emmons reaction |
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