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

Khadija Hakouk (1) , Olivier Oms (2) , Anne Dolbecq (2) , Hani El Moll (2) , Jerome Marrot (2) , Michel Evain (1) , Florian Molton (3) , Carole Duboc (3) , Philippe Deniard (1) , Stéphane Jobic (1) , Pierre Mialane (2) , Remi Dessapt (1)

1 IMN - Institut des Matériaux Jean Rouxel
2 ILV - Institut Lavoisier de Versailles
3 DCM - CIRE - Département de Chimie Moléculaire - Chimie Inorganique Redox

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(CH2S(CH3)2)OPO3)2]*8H2O (1) and a new material (Me3S)4[Mo8O26] (2) under UV excitation are investigated by diffuse reflectance spectroscopy, revealing that the color change effect is highly tunable playing with the nature of the POM. A mechanism involving the photoreduction of Mo6+ cations associated with electron transfers from the sulfonium cations toward the POMs is proposed.

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Khadija Hakouk, Olivier Oms, Anne Dolbecq, Hani El Moll, Jerome Marrot, et al.. Sulfonium Polyoxometalates: A New Class of Solid-State Photochromic Hybrid Organic-Inorganic Materials. Inorganic Chemistry, 2013, 52 (2), pp.555. ⟨10.1021/ic302477p⟩. ⟨hal-00981693⟩