Mechanism of melanogenesis inhibition by Keggin-type polyoxometalates

Abstract

Abnormal melanin overproduction can result in hyperpigmentation syndrome in human skin diseases and enzymatic browning of fruits and vegetables. Recently, our group found that Keggin-type polyoxometalates (POMs) can efficiently inhibit...

Three Viologen Compounds Containing Keggin and Mo-Capped Weakley Polyoxometalates: Photo-/Thermo-/Electro-Chromic Studies

“…As a class of excellent metal oxide nanoclusters, polyoxometalates (POMs) have advantages of adjustable composition, clear structure, excellent redox performance, etc., and have potential applications in catalysis, optics, medicine, electrochemistry, and other fields. − The surface of POMs has abundant oxygen atoms and high electronegativity, so it has the ability to provide electrons to electron acceptors . Due to its electron-rich property, combining it with electron-deficient viologen compounds can promote the electron transfer of viologen compounds, which can speed up their color-changing process. − In this paper, we introduced two kinds of viologens to the POM field, namely, 1-(3,5-dimethyl-isoxazol-4-ylmethyl)-[4,4’]­bipyridinyl-1-ium chloride (dibipy·Cl) and 1-(4-nitro-benzyl)-[4,4’]­bipyridinyl-1-ium chloride (nibipy·Cl, Scheme ).…”