Evaluation of circularly polarized luminescence in a chiral lanthanide ensemble†,Molecular Systems Design & Engineering

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Evaluation of circularly polarized luminescence in a chiral lanthanide ensemble†
Molecular Systems Design & Engineering ( IF 3.2 ) Pub Date : 2017-10-03 00:00:00 , DOI: 10.1039/c7me00082k
Yoshinori Okayasu _{1,

2,

3,

4} , Junpei Yuasa _{1,

2,

3,

4,

5}

Affiliation

This work demonstrates a methodology for the evaluation of circularly polarized luminescence of a chiral europium(III) (Eu^III) complex species in an ensemble system. The chiral Eu^III complex species consists of chiral bis(oxazolinyl)pyridine [(R)- or (S)-iPr-Pybox] and β-diketonate ligands with a pendant nitro group (DK-NO₂). The pendant NO₂ group in [iPr-Pybox](Eu^III)(DK-NO₂)₃ (monometallic Eu^III species) coordinates to the Eu^III center of another Eu^III complex, giving rise to the generation of a chiral Eu^III ensemble consisting of mono-, di-, and the other oligomeric Eu^III species, {[iPr-Pybox](Eu^III)(DK-NO₂)₃}_n. The luminescence dissymmetry factors (g_lum) of the chiral Eu^III ensemble have been successfully determined by using a commercially available fluorescence spectrophotometer attached with a rotatable λ/4 filter and a fixed linearly polarized plate. This study suggests that the chiral Eu^III ensemble in solution displays a large circularly polarized luminescence (|g_lum| = 0.19) as compared to that of a reference monometallic complex [iPr-Pybox](Eu^III)(DK-CN)₃ (|g_lum| = 0.11–13). The larger g_lum is primarily attributed to the contribution of the dimetallic Eu^III species exhibiting a high degree of circular polarization in luminescence (g_lum2 = 0.27) in the ensemble. Conversely, a large linearly polarized component was observed in luminescence from the chiral Eu^III ensemble in the solid state (KBr pellet).

中文翻译：

在手性镧系元素集合中评估圆偏振发光†

这项工作演示了一种用于评估整体系统中手性euro（III）（Eu ^III）复杂物种的圆偏振发光的方法。手性Eu ^III配合物由手性双（恶唑啉基）吡啶[（R）-或（S）-iPr-Pybox]和带有侧基硝基（DK-NO ₂）的β-二酮酸酯配体组成。[iPr-Pybox]（Eu ^III）（DK-NO ₂）₃（单金属Eu ^III物种）中的NO ₂侧基与另一个Eu ^III的Eu ^III中心配位复杂，从而产生了由单，双和其他低聚Eu ^III物种{[iPr-Pybox]（Eu ^III）（DK-NO ₂）₃ } _n组成的手性Eu ^III集合。通过使用附有可旋转λ / 4滤光片和固定线性偏振板的市售荧光分光光度计，已成功确定了手性Eu ^III系的发光不对称因子（g _lum）。这项研究表明，溶液中的手性Eu ^III系团显示出较大的圆偏振发光（| g _lum| 与参考单金属配合物[iPr-Pybox]（Eu ^III）（DK-CN）_3相比（| g _lum | = 0.11–13）= 0.19）。较大的g _lum主要是归因于在发光中显示出高度圆偏振的双金属Eu ^III物种的贡献（g _lum2 = 0.27）。相反，从固态的手性Eu ^III团簇（KBr团粒）的发光中观察到了较大的线性极化成分。

更新日期：2017-10-03

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