Chemical Structure / July 19, 2018 / Willa Page
Pure avobenzone is a whitish to yellowish crystalline powder with a weak odor, dissolving in isopropanol, decyl oleate, capric acidcaprylic acid triglycerides and other oils. Avobenzone is a dibenzoylmethane derivative. Avobenzone exists in the ground state as a mixture of the enol and keto forms, favoring the chelated enol. This enol form is stabilized by intramolecular hydrogen-bonding within the β-diketone. Its ability to absorb ultraviolet light over a wider range of wavelengths than many other sunscreen agents has led to its use in many commercial preparations marketed as "broad spectrum" sunscreens. Avobenzone has an absorption maximum of 357 nm.
Sodium perchlorate is the inorganic compound with the chemical formula NaClO4. It is a white crystalline, hygroscopic solid that is highly soluble in water and in alcohol. It usually encountered as the monohydrate. The compound is noteworthy as the most soluble of the common perchlorate salts. Sodium perchlorate is the precursor to many other perchlorate salts, often taking advantage of their low solubility relative to NaClO4 (209 g100 mL at 25 °C). Perchloric acid is made by treating NaClO4 with HCl. Ammonium and potassium perchlorate, of interest in pyrotechnics, are prepared by double decomposition from a solution of sodium perchlorate and potassium or ammonium chlorides.
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