Solid-emissive fluorophores constructed by a non-planar heteropolycyclic structure with bulky substituents: synthesis and X-ray crystal structures
作者:Yousuke Ooyama、Shintaro Yoshikawa、Shigeru Watanabe、Katsuhira Yoshida
DOI:10.1039/b700848a
日期:——
of the phenyl and thienyl rings in the solid state. In addition, the X-ray crystal structures demonstrated that, in and , the non-planar structure with sterically hindered substituents prevents the fluorophores from forming short pi-pi contacts and produces strong solid-state fluorescence. On the other hand, in the crystal of , the formation of continuous intermolecular CH[dot dot dot]S bonding between
设计了具有平面受阻取代基(R =丁基,苯基和噻吩基)的非平面结构的新型固体发射型茚并[1,2-b]苯并[4,5-e]吡喃-11-一型荧光团并方便地合成。1,4-二恶烷的荧光量子产率为(Phi = 0.053)>>(Phi = 0.013)>(Phi = 0.003)。另一方面,荧光团的固态荧光量子产率为(Phi = 0.39)>(Phi = 0.15)>(Phi = 0.06)。为了阐明溶液,固态和荧光团之间量子产率的巨大差异,我们进行了时间分辨荧光光谱测量,半经验分子轨道计算(AM1和INDO / S)以及X射线晶体学分析的 。由溶液和晶体状态下的时间分辨光谱测量确定的辐射速率常数和非辐射速率常数的比较结果表明,通过限制苯环和噻吩基环的旋转,可以减少非辐射衰变。固体状态。另外,X射线晶体结构证明,在和中,具有空间位阻取代基的非平面结构防止荧光团形成短的pi-pi接触并产生强的固态荧光。另