Coloured hybrid materials: exploiting an emergent surface property of fluorinated AlO containing anthocyanins and betacyanins.

Two fluorinated γ-AlO series were synthesized by a sol-gel method with two solvents (2-propanol and 2-butanol), two aluminium sources (ATB and ATP) and one fluorine source (NaAlF). The resulting inorganic matrixes were evaluated to characterize aluminium and fluorine species ([AlO], [AlO], [AlO], [AlF], [AlF] and [AlF]) by powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Al magic angle spinning nuclear magnetic resonance (Al MAS-NMR) and infrared spectroscopy (IR-ATR). BET and BJH analyses using the nitrogen isotherms of these materials allowed identifying a clear trend in some textural parameters such as specific surface area and fluorine content.