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Insertion of isatin molecules into the nanostructure of palygorskite

机译：将伊斯汀分子插入坡缕石的纳米结构

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摘要

Palygorskite has unique a groove-and-channel nanostructure to protect inserted molecules from ruin, and Maya blue is a perfect example of this phenomenon. In this paper, a new hybrid pigment prepared by inserting isatin into palygorskite was synthesized and analyzed. The hybrid retained its vivid color even after being boiled for 5 h in 30% H2O2 aqueous solution. Protected by palygorskite, 59% of the isatin successfully survived 72 h of CHCl3 Soxhlet extraction of the hybrid. Ultraviolet-near infrared spectroscopy (UV-NIR) and Fourier transform infrared spectroscopy (FT-IR) indicated that the conjugate plan of isatin might be distorted when inserted to palygorskite, just like indigo did in Maya blue. X-ray diffraction analysis (XRD) and high-resolution transmission electron microscopy (HRTEM) pointed out that palygorskite exhibited a certain degree of lattice distortion after hybridization. Thermal gravity and differential thermal gravity analysis (TG-DTG) showed further that the small-size isatin could go deeper into the channels of palygorskite and block the channel entrance better than indigo did in Maya blue. All analyses indicated that isatin inserted deeply into the clay, and the insertion is much deeper than that of indigo.
机译：坡缕石具有独特的凹槽和通道纳米结构，可保护插入的分子免受破坏，而玛雅蓝是这种现象的完美例证。本文合成和分析了一种通过将伊斯丁插入坡缕石中制备的新型杂化颜料。即使在30％H2O2水溶液中煮沸5小时后，杂种仍保留其鲜艳的颜色。在坡缕石的保护下，59％的靛红成功地存活了72小时的CHCl3索氏提取的杂种。紫外-近红外光谱（UV-NIR）和傅里叶变换红外光谱（FT-IR）表明，插入坡缕石中时，靛红的共轭平面可能会变形，就像靛蓝在玛雅蓝中那样。 X射线衍射分析（XRD）和高分辨率透射电子显微镜（HRTEM）指出，凹凸棒石在杂交后表现出一定程度的晶格畸变。热引力和差示热引力分析（TG-DTG）进一步表明，与玛雅蓝相比，小尺寸的isatin可以更深地进入坡缕石的通道，并更好地阻塞通道入口。所有分析都表明，伊斯廷丁深深插入粘土中，并且插入程度比靛蓝大得多。

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