Benzo[<i>b</i>]phosphole-Containing π-Electron Systems: Synthesis Based on an Intramolecular<i>trans</i>-Halophosphanylation and Some Insights into Their Properties
wavelengths. The intrinsic substituent effects of the phosphoryl group in this skeleton are to decrease the oscillator strength of the electronic transition and thus decrease the radiative decayrate constants from the singlet excited state. Nevertheless, these compounds maintain high fluorescence quantum yields (ΦF>0.8) owing to the significantly retarded nonradiativedecay process. In the study of the benzodiphosphole
PBr 3介导的2-(氨基膦酰基)苯基乙炔分子内反式-卤代膦酰基化反应,再用H 2 O 2氧化,生成3-溴代苯并[ b ]氧化膦衍生物。通过在LiI存在下进行反应,这种环化反应也可用于合成3-碘衍生物。在此基础上合成的方法中,各种含benzophosphole-π共轭系化合物,其中磷和亚甲基桥连的二苯乙烯10,2,3,6,7- tetraphenylbenzo [1,2 b:4,5- b '] diphosphole- P, P'-二氧化物11及其硫化膦衍生物12是合成的。在一系列的桥接茋的,包括双(亚甲基)-bridged茋结构-性能关系的研究10,和双(磷酰基)-bridged茋,揭示了作为磷酰基的贡献增加,吸收发射最大值基本上转移到更长的波长。该骨架中磷酰基的固有取代基作用是降低电子跃迁的振荡强度,从而降低来自单重态激发态的辐射衰减速率常数。然而,这些化合物保持高荧光量子产率(Φ ˚F由于显著延迟非辐射的衰变过程>
Environment-Sensitive Fluorescent Probe: A Benzophosphole Oxide with an Electron-Donating Substituent
Electron‐donating aryl groups were attached to electron‐accepting benzophosphole skeletons. Among several derivatives thus prepared, one benzophospholeoxide was particularly interesting, as it retained high fluorescence quantum yields even in polar and protic solvents. This phosphole‐based compound exhibited a drastic color change of its fluorescence spectrum as a function of the solvent polarity