Organic–inorganic hybrid pigments with enhanced thermo- and photostability have been prepared by co-intercalating C.I. Acid Red 337 (AR337) and a UV absorbent (BP-4) into the interlayer of ZnAl layered double hydroxides through a coprecipitation method. The obtained compounds were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, thermogravimetric–differential thermogravimetric–differential thermal analysis, UV–visible spectroscopy, and the International Commission on Illumination (CIE) 1976 L*a*b* color scales. The results show the successful co-intercalation of AR337 and BP-4 into the interlayer region of layered double hydroxides (LDHs) and reveal the presence of host–guest interactions between LDH host layers and guest anions of AR337 and BP-4 and guest–guest interactions between AR337 and BP-4. The intercalation can improve the thermostability of AR337 due to the protection of LDH layers. Moreover, the co-intercalation of AR337 and BP-4 not only markedly enhances the photostability of AR337 but also significantly influences the color of the hybrid pigment.

中文翻译：

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合作-酸性红337和紫外线吸收剂的嵌入到滑石：光稳定性增强

通过共沉淀法将CI酸性红337（AR337）和紫外线吸收剂（BP-4）共同嵌入ZnAl层状双氢氧化物的中间层中，从而制备了具有增强的热稳定性和光稳定性的有机-无机杂化颜料。所得化合物的特征在于X射线衍射，傅立叶变换红外光谱，扫描电子显微镜，热重-差热重-差热分析，紫外-可见光谱和国际照明委员会（CIE）1976 L * a * b *色标。结果表明，AR337和BP-4成功共插入层状双氢氧化物（LDHs）的夹层区域，并揭示了LDH主体层与AR337和BP-4的客体阴离子以及客体-客体之间存在主客体相互作用AR337和BP-4之间的访客交互。由于保护了LDH层，该插层可以提高AR337的热稳定性。而且，AR337和BP-4的共插入不仅显着增强了AR337的光稳定性，而且显着影响了杂化颜料的颜色。