Phenolphthalein quinone dianion (PPN q 2− ) exhibits excellent UV−vis absorbing capacity; however, it has never been considered as UV-absorbing materials because of the pH-dependent proton dissociation equilibrium. Here, layered double hydroxides (LDHs) are served as stable alkaline hosts to capture and fix the PPN q 2− into their interlayers selectively. The resultant composites display a broad and strong absorption of UV light. Moreover, the alkaline hosts protect the ionization state of PPN q 2− in a wide pH range and a long-term irradiation condition so that the material can be used as a UV-absorber in practice. This hybrid material effectively suppresses the UVphotodegradation of bitumen in terms of the viscosity aging index, softening point increment, and morphology. This simple host−guest strategy opens a new platform for exploring LDHs based molecular recognition and material innovation.
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