Coue, V., Dessapt, R., Bujoli-Doeuff, M., Evain, M. & Jobic, S. (2007) Synthesis, characterization, and photochromic properties of hybrid organic-inorganic materials based on molybdate, DABCO, and piperazine. Inorg. Chem. 46 2824–2835.
Added by: Laurent Cournède (2016-03-10 22:02:30)
|Type de référence: Article
Numéro d'identification (ISBN etc.): 0020-1669
Clé BibTeX: Coue2007
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Mots-clés: aqueous polymolybdate solutions, building-blocks, composite-solids, crystal-structure, Hydrothermal synthesis, metal oxides, Molybdenum oxide, octamolybdate clusters, polyoxomolybdate clusters, subunits
Créateurs: Bujoli-Doeuff, Coue, Dessapt, Evain, Jobic
Collection: Inorg. Chem.
Consultations : 2/894
Indice de consultation : 5%
Indice de popularité : 1.25%
Prompted by our interest in new photochromic organic-inorganic hybrid materials, the reactivity of [Mo7O24](6-) toward a structure-directing reagent diamine such as 1,4-diazabicyclo[2.2.2]octane (DABCO) and piperazine (pipz) has been investigated, and three new molybdenum(VI)-containing compounds, namely, (H(2)DABCO)(3)[Mo7O24]center dot 4H(2)O (1), (H(2)DABCO)[Mo3O10]center dot H2O (2), and (H(2)DABCO)(2)(NH4)(2)[Mo8O27]center dot 4H(2)O (3), have been synthesized and characterized. New synthetic routes to achieve the known compounds (H(2)DABCO)(2)(H(2)pipz)[Mo8O27] (4), (H(2)pipz)(3)[Mo8O27] (5), and (H(2)DABCO)(2)[Mo8O26]center dot 4H(2)O (6) are also reported. All of these compounds contain different poly(oxomolybdate) clusters, i.e., discrete [Mo7O24](6-) blocks in 1, infinite polymeric chains (1)/(infinity)[Mo3O10](2-) in 2, (1)/(infinity)[Mo8O27](6-) in 3-5, and (1)/(infinity)[Mo8O26](4-) in 6, associated in a tridimensional assembly by hydrogen bonds with H(2)DABCO(2+) and/or H(2)pipz(2+) cations. Interconversion pathways and chemical factors affecting the stabilization of the different species are highlighted and discussed. At the opposite of 6, compounds 1-5 show photochromic behavior under UV excitation. Namely, compounds 1-5 shift from white or pale yellow to pale pink, reddish brown, or purple under UV illumination depending on the chemical nature of the mineral framework, with the kinetics of the color change being dictated by the nature of the organic component and by the organic-inorganic interface.
Added by: Laurent Cournède