Sulfonium Polyoxometalates: A New Class of Solid-State Photochromic Hybrid Organic-Inorganic Materials.

For the very first time, sulfonium polyoxometalate (POM) assemblies are shown to develop efficient solid-state photochromism in ambient conditions. The optical properties of the already known Rb0.75(NH4)5.25[(Mo3O8)2O(O3PC(CH2SMe2)OPO3)2]·8H2O (1) and (Me3S)4[Mo8O26] (2) under UV excitation were studied by diffuse reflectance spectroscopy, revealing that the color change effect is highly tunable playing with the nature of the POM. A mechanism involving the photoredn. of Mo6+ cations assocd. with electron transfers from the sulfonium cations toward the POMs is proposed. [on SciFinder(R)]


Soumis le 12 avril 2018