title: Sulfonium polyoxometalates: a new class of solid-state photochromic hybrid organic-inorganic materials.
abstract: 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 Rb(0.75)(NH(4))(5.25)[(Mo(3)O(8))(2)O(O(3)PC(CH(2)S(CH(3))(2))OPO(3))(2)]·8H(2)O (1) and a new material (Me(3)S)(4)[Mo(8)O(26)] (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 Mo(6+) cations associated with electron transfers from the sulfonium cations toward the POMs is proposed.
authors.affiliation: Institut des Matériaux Jean Rouxel, Université de Nantes, CNRS, 2 rue de la Houssinière, BP 32229, 44322 Nantes cedex, France.
authors.forename: Khadija
authors.initials: K
authors.lastname: Hakouk
authors.forename: Olivier
authors.initials: O
authors.lastname: Oms
authors.forename: Anne
authors.initials: A
authors.lastname: Dolbecq
authors.forename: Hani
authors.initials: H
authors.lastname: El Moll
authors.forename: Jérôme
authors.initials: J
authors.lastname: Marrot
authors.forename: Michel
authors.initials: M
authors.lastname: Evain
authors.forename: Florian
authors.initials: F
authors.lastname: Molton
authors.forename: Carole
authors.initials: C
authors.lastname: Duboc
authors.forename: Philippe
authors.initials: P
authors.lastname: Deniard
authors.forename: Stéphane
authors.initials: S
authors.lastname: Jobic
authors.forename: Pierre
authors.initials: P
authors.lastname: Mialane
authors.forename: Rémi
authors.initials: R
authors.lastname: Dessapt