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Two new inorganic-organic hybrid materials based on ?-and ?-octamolybdate clusters: Synthesis, structure determination and solid-state photochromic properties

Two new hybrid inorganic–organic compounds, namely (iPr2NH2)2(NH4)2[Mo8O26] (1) and (C4H7N2)4[Mo8O26(C4H6N2)2]·2H2O (2), have been synthesized from room temperature, and characterized by vibrational spectroscopies, thermal gravimetric analysis (TGA) and single-crystal X-ray diffraction. Compound (1) contains a ?-octamolybdate anionic cluster (?-[Mo8O26]4?) stabilized with two ammonium [NH4]+ and two diisopropylammonium [iPr2NH2]+ cations. Compound (2) is built upon a ?-octamolybdate anionic cluster (?-[Mo8O26]4?) functionalized by two neutral 2-methylimidazole (C4H6N2) molecules, and stabilized by four protonated 2-methylimidazolium [C4H7N2]+ cations. Single-crystal X-ray diffraction analyses reveal that the compounds have 2D and 3D supramolecular structures resulting from electrostatic and H-bonding interactions between inorganic and organic entities. Both compounds exhibit distinct solid-state photochromic properties at room temperature which vary with the nature of both the polyoxometalate clusters and the organoammonium cations.

Auteur(s) : Bougar Sarr, Abdou Mbaye, Cheikh AK Diop, Mamadou Sidibé, Frederic Melin, Petra Hellwig, Francis Maury, Cédric Charvillat, Michel Giorgi, François Mic
Pages : 114919
Année de publication : 2020
Revue : Polyhedron
N° de volume : Volume 194, 15 January 2021,
Type : Article
Mise en ligne par : DIOP Cheikh Abdoul Khadir