The photochemical characteristics of aromatic enediyne compounds substituted with electron donating and electron withdrawing groups
作者:Yoshihiro Miki、Atsuya Momotake、Tatsuo Arai
DOI:10.1039/b305816f
日期:——
trans- and cis-1-(4-Dimethylaminophenyl)-6-(4-nitrophenyl)hex-3-ene-1,5-diynes (trans- and cis-DANE) were synthesized and their photochemical properties were studied. The absorption spectra of trans-DANE red-shifted compared with the parent compound bisphenylethynylethene (BEE) due to intramolecular charge transfer. The fluorescence spectra, Stokes shift, fluorescence lifetime, fluorescence quantum
合成了反式和顺式-1-(4-二甲基氨基苯基)-6-(4-硝基苯基)己-3-烯-1,5-二炔(反式和顺式-DANE),并对其光化学性质进行了研究。由于分子内电荷转移,与母体化合物双苯基乙炔基乙烯(BEE)相比,反式DANE的吸收光谱发生了红移。反式-DANE的反式-顺式光异构化的荧光光谱,斯托克斯位移,荧光寿命,荧光量子产率和量子产率显示出在弱极性区域中对溶剂极性的强烈依赖性。在中等极性和极性溶剂中未观察到反式DANE的荧光发射。顺式-反式异构化的量子产率几乎与溶剂无关。供体-受体取代基使反式垂直三重态与反平面三重态之间的平衡转变为反三重态,从而延长了三重态的寿命。反式-DANE与反式-4-二甲基氨基-4'-亚硝基二苯乙烯(DANS)的光化学性质比较表明,反式-DANE是非极性区域中可能的荧光探针。