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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Twisted Intramolecular Charge Transfer States in Trinary Star-Shaped Triphenylamine-Based Compounds
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Twisted Intramolecular Charge Transfer States in Trinary Star-Shaped Triphenylamine-Based Compounds

机译:扭曲的分子内电荷转移状态在杂交星形三苯胺基化合物中

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摘要

Excited state dynamics of trinary star-shaped dendritic compounds with triphenylamine arms and different cores were studied by means of time-resolved fluorescence and transient absorption. Under optical excitation, nonpolar C _(3) symmetry molecules form polar excited states localized on one of the molecular substituents. Conformational excited state stabilization of molecules with an electron-accepting core causes a formation of twisted internal charge transfer (TICT) states in polar solvents. A low transition dipole moment from TICT state to the ground state causes very weak fluorescence of those compounds and strong dependence on the solvent polarity. The compound formed from the triphenylamine central core and identical arms also experiences excited state twisting, however, weakly sensitive to the solvent polarity.
机译:通过时间分辨的荧光和瞬态吸收研究了具有三苯胺臂和不同核心的杂于星形树枝状细胞和不同核的激发状态动态。 在光学激发下,非极性 C _(3)对称性分子形成极性激发态,本地在其中一种分子取代基上。 具有电子接受核的组合激发状态稳定分子稳定导致极性溶剂中的扭曲内部电荷转移(TICT)状态。 从TICT状态到地态的低过渡偶极力矩会导致这些化合物的荧光非常弱,并且对溶剂极性的强依赖性。 由三苯胺中央核心和相同臂形成的化合物也经历激发的状态扭曲,然而,对溶剂极性弱敏感。

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