TY - JOUR
T1 - Synthesis and luminescent properties of star-burst D-π-A compounds based on 1,3,5-triazine core and carbazole end-capped phenylene ethynylene arms
AU - Zhang, Zheng
AU - Liu, Rui
AU - Zhu, Xiaolin
AU - Li, Yuhao
AU - Chang, Jin
AU - Zhu, Hongjun
AU - Ma, Liangwei
AU - Lv, Wangjie
AU - Guo, Jun
PY - 2014/1/1
Y1 - 2014/1/1
N2 - Two new star-burst compounds based on 1,3,5-triazine core and carbazole end-capped phenylene ethynylene arms (1a and 1b) were synthesized and characterized. Their photophysical properties were investigated systematically via spectroscopic and theoretical methods. Both compounds exhibit strong 1π-π* transitions in the UV region and intense 1π-π*/intramolecular charge transfer (1ICT) absorption bands in the UV-vis region. Introducing the carbazole end-capped phenylene ethynylene arm on the 1,3,5-triazine core causes a slight bathochromic shift and enhanced molar extinction coefficient of the 1π- π*/1ICT transition band. Both compounds are emissive in solution at room temperature and 77 K, which exhibit pronounced positive solvatochromic effect. The emitting state could be ascribed to 1ICT state in more polar solvent, and 1π-π* state in low-polarity solvent. The high emission quantum yields (Φem=0. 90~1.0) of 1a and 1b (in hexane and toluene) make them potential candidates as efficient light-emitting materials. The spectroscopic studies and theoretical calculations indicate that the photophysical properties of these compounds can be tuned by the carbazole end-capped phenylene ethynylene arm, which would also be useful for rational design of photofunctional materials.
AB - Two new star-burst compounds based on 1,3,5-triazine core and carbazole end-capped phenylene ethynylene arms (1a and 1b) were synthesized and characterized. Their photophysical properties were investigated systematically via spectroscopic and theoretical methods. Both compounds exhibit strong 1π-π* transitions in the UV region and intense 1π-π*/intramolecular charge transfer (1ICT) absorption bands in the UV-vis region. Introducing the carbazole end-capped phenylene ethynylene arm on the 1,3,5-triazine core causes a slight bathochromic shift and enhanced molar extinction coefficient of the 1π- π*/1ICT transition band. Both compounds are emissive in solution at room temperature and 77 K, which exhibit pronounced positive solvatochromic effect. The emitting state could be ascribed to 1ICT state in more polar solvent, and 1π-π* state in low-polarity solvent. The high emission quantum yields (Φem=0. 90~1.0) of 1a and 1b (in hexane and toluene) make them potential candidates as efficient light-emitting materials. The spectroscopic studies and theoretical calculations indicate that the photophysical properties of these compounds can be tuned by the carbazole end-capped phenylene ethynylene arm, which would also be useful for rational design of photofunctional materials.
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U2 - 10.1016/j.jlumin.2014.07.025
DO - 10.1016/j.jlumin.2014.07.025
M3 - Article
SN - 0022-2313
VL - 156
SP - 130
EP - 136
JO - Journal of Luminescence
JF - Journal of Luminescence
ER -