Crystal Structures and Fluorescence Spectroscopic Properties of a Series of α,ω-Di(4-pyridyl)polyenes: Effect of Aggregation-Induced Emission.,ChemPlusChem

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Crystal Structures and Fluorescence Spectroscopic Properties of a Series of α,ω-Di(4-pyridyl)polyenes: Effect of Aggregation-Induced Emission.
ChemPlusChem ( IF 3.0 ) Pub Date : 2020-08-03 , DOI: 10.1002/cplu.202000285
Yoriko Sonoda ₁ , Norimitsu Tohnai ₂ , Yukihiro Shimoi ₃

Affiliation

Crystal structures and fluorescence spectroscopic properties were investigated for a series of all‐(E) α,ω‐di(4‐pyridyl)polyenes (1–5) with different number of double bonds (n). Molecules 1 and 2 (n=1, 2) in crystals are arranged to form partially π‐overlapped structures, whereas those of 3–5 (n=3–5) are stacked in a herringbone fashion. All these molecules, the shorter polyenes in particular, are almost nonfluorescent in solution. In the solid state, 1 and 2 are highly emissive as pure organic solids [fluorescence quantum yields (φ_f)=0.3–0.5], while 3 and 4 are only weakly fluorescent (φ_f<0.05). The strongly n‐dependent fluorescence properties can be attributed to the largely different molecular arrangements in the crystals. Although 5 is nonfluorescent in the solid state, we observe a very clear structure‐property relationship in 1–4. Compounds 1 and 2 become much more emissive in the solid state than in solution as a result of the aggregation‐induced emission (AIE) effect.

中文翻译：

一系列α，ω-二（4-吡啶基）多烯的晶体结构和荧光光谱性质：聚集诱导发射的影响。

晶体结构和荧光光谱性质进行了研究了一系列清一色（的ë）α，ω二（4-吡啶基）多烯（1 - 5）用不同数量的双键（Ñ）。晶体中的分子1和2（n = 1，2）排列成部分π重叠的结构，而3 – 5（n = 3–5）的分子以人字形堆叠。所有这些分子，特别是较短的多烯，在溶液中几乎是无荧光的。在固态时1和2是纯的有机固体[荧光量子产率（高发射φ _˚F）= 0.3-0.5]，而3和4是只有弱的荧光（φ _˚F <0.05）。强烈依赖于n的荧光性质可以归因于晶体中分子排列的极大不同。虽然5是在固态非荧光，我们看到一个非常清晰的结构-性能关系1 - 4。由于聚集诱导发射（AIE）效应，化合物1和2的固态发射比溶液中的发射大得多。

更新日期：2020-09-01

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