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| At the molecular level, the emission intensity of luminophors is usually related to intramolecular effects and intermolecular packing. Intramolecular effects on fluorescence enhancement could be attributed to the various molecular conformations of the luminophors. For example, the weak fluorescence of the special luminophors in solution may be a consequence of their twisted conformations, which led to a large non-radiative rate constant. However, the molecular conformation became planar fter aggregation, which blocked the non-radiation process, and the fluorescence intensity was enhanced. In this case, the pristine powders yielded a fluorescence lifetime of τ=0.65 ns (ΦPL =0.4%) with a relatively high non-radiative rate constant of knr = (1 -ΦPL)/τF= 1.5×10ˆ9 sˆ-1 as shown in Fig. S6.† Indeed, the single-crystal structures revealed that the TPA-CO molecules, with a dihedral angle (θ) ranging from 30° to 64°, were highly twisted (Chart 1), which was in accordance with the experimental results above. |
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团子小姐: 金币+8, 翻译EPI+1, ★★★★★最佳答案, 谢谢 2014-10-15 19:50:27
团子小姐: 金币+8, 翻译EPI+1, ★★★★★最佳答案, 谢谢 2014-10-15 19:50:27
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在分子水平上,荧光材料的发光强度通常和分子内部的效应及分子间的挤压有关。导致荧光增强的分子内部的效应可归因于荧光材料可能存在的众多分子构象。比如,特殊荧光材料在溶液中发射出弱荧光可能是它们构象扭曲的结果,构象扭曲会产生一个大的非辐射速率常数。 然而聚合之后分子构象会变成二维的,从而阻止了非辐射过程,造成荧光强度的提高。在这个例子中,初始的粉末产生的荧光寿命是τ=0.65 ns (ΦPL =0.4%),而非辐射速率常数却相对较高,为knr = (1 -ΦPL)/τF= 1.5×10ˆ9 sˆ-1(Fig. S6.†)。实际上,TPA-CO分子的单晶结构揭示它是高度扭曲的(双面角(θ)范围从30° 到 64°),这和上述实验结果一致。 非专业翻译,仅供参考。。。 |

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