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首页> 外文期刊>Chemistry: A European journal >An Indigo Carmine-Based Hybrid Nanocomposite with Supramolecular Control of Dye Aggregation and Photobehavior
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An Indigo Carmine-Based Hybrid Nanocomposite with Supramolecular Control of Dye Aggregation and Photobehavior

机译：一种基于靛蓝胭脂红的超分子控制染料聚集和光行为的杂化纳米复合材料

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摘要

Zn-Al layered double hydroxides (LDHs) containing solely indigo carmine (IC) or 1-hexanesulfonate (HS) anions, or a mixture of the two with different HS/IC molar ratios, were prepared by the direct synthesis method and characterized by various techniques. Hydrotalcite-type phases were obtained with basal spacings of 17.6 angstrom for the LDH intercalated by IC (IC-LDH) and 18.2-18.3 angstrom for the other materials containing HS. From the basal spacing for IC-LDH and UV/Vis spectroscopic data, it is proposed that the dye molecules assemble within the interlayer galleries to form a J-type stacking arrangement. A comprehensive electronic spectral and photophysical study was undertaken for IC in solution and all materials, aiming to obtain a detailed characterization of the host-guest and guest-guest interactions. In solution (the solvent surrounded isolated molecule), IC presents a fast excited state proton transfer with rate constants of approximate to 1.2-1.4x10(11)s(-1), which is linked to the very efficient radiationless deactivation channel. In the solid state it is shown that incorporation of IC within the LDH decreases the level of aggregation, and that further addition of HS induces the appearance of isolated IC units within the LDH galleries. The indigo carmine-based nanocomposites reported constitute a step forward in the design of hybrid materials with tunable properties.
机译：通过直接合成方法制备了仅含有靛蓝胭脂红（IC）或1-己磺酸盐（HS）阴离子或两种具有不同HS / IC摩尔比的混合物的Zn-Al层状双氢氧化物（LDHs），并具有多种特征技术。通过IC（IC-LDH）插入的LDH的基间距为17.6埃，而其他含有HS的材料的基间距为18.2-18.3埃，获得了水滑石型相。从IC-LDH的基本间距和UV / Vis光谱数据来看，建议染料分子在层间通道内组装以形成J型堆叠结构。对溶液中和所有材料中的IC进行了全面的电子光谱和光物理研究，旨在获得宿主-客体和客体-客体相互作用的详细表征。在溶液（溶剂包围的分离分子）中，IC呈现快速激发态质子转移，速率常数约为1.2-1.4x10（11）s（-1），与非常有效的无辐射失活通道相关。在固态状态下，表明在LDH中掺入IC会降低聚集水平，并且进一步添加HS会导致LDH通道中出现孤立的IC单元。报道的基于靛蓝胭脂红的纳米复合材料构成了具有可调特性的杂化材料设计的一个进步。

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