Compared to planar carbazole, the molecular conjugation of iminodibenzyl (Id) was destroyed by a C–C bond and a twisted structure was formed, which exhibited blue-shifted ultralong phosphorescence with a lifetime of 402 ms in a crystal under ambient conditions. For the presence of an oscillating C–C bond between the two benzene rings in Id, more than one molecular configuration in the crystal was discovered by X-ray single-crystal analysis. Moreover, its ultralong phosphorescence color changed from blue to green by varying the excitation wavelength in solution at 77 K. Theoretical calculations also confirmed that different molecular configurations had certain impact on the phosphorescent photophysical properties. This result will allow a major step forward in expanding the scope of ultralong organic phosphorescent (UOP) materials, building a bridge to realize the relationship between molecular structure and UOP property.

中文翻译：

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调节超长有机磷光的扭曲分子结构

与平面咔唑相比，亚氨基二苄基（Id）的分子共轭被C–C键破坏，并形成扭曲结构，该结构在环境条件下在晶体中表现出蓝移超长磷光，寿命为402 ms。对于Id中两个苯环之间存在振荡的CC键，通过X射线单晶分析发现了晶体中一个以上的分子构型。此外，通过改变溶液在77 K处的激发波长，其超长磷光色从蓝色变为绿色。理论计算还证实，不同的分子构型对磷光光物理性质有一定影响。这一结果将为扩大超长有机磷光（UOP）材料的范围迈出重要一步，