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The large bathochromic shift combined with the decreasedF might be related to the stabilization of the excited state. This behavior is frequently observed in highly polarized molecules exhibiting enlarged dipoles and charge-transfer characters in their excited states referred to as intramolecular charge-transfers (ICT). 13 Since solvent polarity had little effect on the absorption wavelengths of the compounds, their solvatochromisms might be caused by photo-induced ICT in the excited state, suggesting that the ICT excited state had a larger dipolar moment compared with the ground state, due to substantial charge redistribution.

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笔墨轻点: 金币+15, 翻译EPI+1, ★★★★★最佳答案 2014-11-05 16:43:05
大红移合并F降低可能与激发态的稳定化有关。这种现象经常出现在高度两极化的分子,表现为扩大的偶极以及在激发态时的电荷转移特点,称之为分子内电荷转移(ICT)。由于溶剂的极性对化合物的吸收波长的影响很小,在激发态时它们的溶剂化可能是由光诱导的ICT引起的,表明与研磨状态相比,ICT激发态有较大的偶极矩,因为大量电荷再分配。
2楼2014-11-05 13:15:04
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