Oligo(ethylene glycol)/alkyl‐modified Chromophore Assemblies for Photon Upconversion in Water,Chemistry - An Asian Journal

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Oligo(ethylene glycol)/alkyl‐modified Chromophore Assemblies for Photon Upconversion in Water
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2019-01-17 , DOI: 10.1002/asia.201801666
Rena Haruki ₁ , Hironori Kouno ₁ , Masanori Hosoyamada ₁ , Taku Ogawa ₁ , Nobuhiro Yanai _{1,

2} , Nobuo Kimizuka ₁

Affiliation

Molecular self‐assembly is a powerful means to construct nanoscale materials with advanced photophysical properties. Although the protection of the photo‐excited states from oxygen quenching is a critical issue, it still has been in an early phase of development. In this work, we demonstrate that a simple and typical molecular design for aqueous supramolecular assembly, modification of the chromophoric unit with hydrophilic oligo(ethylene glycol) chains and hydrophobic alkyl chains, is effective to avoid oxygen quenching of triplet–triplet annihilation‐based photon upconversion (TTA‐UC). While a TTA‐UC emission is completely quenched when the donor and acceptor are molecularly dispersed in chloroform, their aqueous co‐assemblies exhibit a clear upconverted emission in air‐saturated water even under extremely low chromophore concentrations down to 40 μm. The generalization of this nano‐encapsulation approach offers new functions and applications using oxygen‐sensitive species for supramolecular chemistry.

中文翻译：

寡聚（乙二醇）/烷基修饰的发色团在水中进行光子上转换

分子自组装是构建具有先进光物理性质的纳米级材料的有力手段。尽管保护光激发态免受氧猝灭是一个关键问题，但它仍处于开发的早期阶段。在这项工作中，我们证明了用于水上超分子组装的简单且典型的分子设计，用亲水性寡聚（乙二醇）链和疏水性烷基链修饰发色单元，可有效避免三重态-三重态an灭基于光子的氧猝灭上转换（TTA-UC）。当供体和受体分子分散在氯仿中时，TTA-UC发射被完全淬灭，米。纳米封装方法的泛化为超分子化学使用了对氧敏感的物质，从而提供了新的功能和应用。

更新日期：2019-01-17

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