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| Thus, the repulsive force was sufficient to block intermolecular excitonic coupling,which caused fluorescence quenching.Fusing all the results together enabled us to draw a clear overall picture for stimuli-responsive behaviours, as depicted in Fig. 6. In the crystalline state, the luminogens may adopt a more twisted conformation in order to fit into the crystalline lattice. Thus, the pristine crystals exhibit a faint luminescence. Upon amorphization by mechanical force,the molecular structure slightly turned planar and the effective intramolecular conjugation was increased, which significantly blocked the non-radiative deactivation pathways. Also, the neighbouring molecules did not get close to one another due to mutually repulsive dipole interactions, which weakened the intermolecular interactions.As a result,the luminescence of ground powders was turned “bright”.The luminescence on-off switching was mainly attributed to the synergy between the planarization of the twisted conformation and weak intermolecular interactions. |
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团子小姐: 金币+8, 翻译EPI+1, ★★★★★最佳答案, 谢谢 2014-10-16 11:59:54
团子小姐: 金币+8, 翻译EPI+1, ★★★★★最佳答案, 谢谢 2014-10-16 11:59:54
| 因此,推斥力可以足以阻止分子间的激发耦合,由此引起荧光猝灭。将所有结果融合在一起,使我们能够得出刺激-响应性能的明确整体图像,如图6所示。在结晶状态下,发光原可以采取一种更扭曲构象,以适应该结晶晶格。因此,原始的结晶表现出微弱的荧光。在机械力作用引起的非晶体化,分子结构稍稍转向平面,有效分子内的偶联增加,这就显著阻断了非辐射失活途径。另外,由于相互排斥性偶极相互作用,使邻近的分子不能彼此接近,从而减弱了分子间的相互作用。其结果是,研磨粉末的发光被明“亮”。发光的通-断切换主要是由于扭曲构象的平面化和弱的分子间相互作用之间的协同的结果。 |
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