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One pot-synthesis of the fourth category of dinuclear molybdenum(VI) oxalate series: Structure and study of thermal and redox properties

Three new dinuclear molybdenum(VI) oxalate (Pr2NH2)4·[Mo2O6(C2O4)2] (1), (iPr2NH2)4·[Mo2O6(C2O4)2] (2) and (HDabco)4[Mo2O6(C2O4)2]·2H2O (3) compounds, have been prepared by one pot-synthesis at room temperature and characterized by single crystal X-ray di raction and vibrational spectroscopies. Each compound contains the binuclear [Mo2O6(C2O4)2]4? anion where each molybdenum is in an octahedral MoO6 environment. In compound (3), the interconnection between [Mo2O6(C2O4)2]4? anions, [HDabco]+ cations and water molecules (H2O) leads to an in nite inorganic-organic chain structure. Similarly, in compounds (1) and (2) the interactions between [Mo2O6(C2O4)2]4? anions and respectively [Pr2NH2]+ and [iPr2NH2]+ cations leads to an in nite inorganic-organic chain structure. A remarkable di erence between the compounds is that in compounds (1) and (2) interactions between the chains involve only Van der Waals forces giving rise to layer-like structures, which also interact between them only by Van der Waals forces, whereas in compound (3) the chains interact also through hydrogen bonds giving a 3D supramolecular structure. The thermal properties of the compounds were investigated through thermogravimetric and di erential thermal analyzes. The di erences in the thermal decomposition of the compounds in the solid state are discussed in relation with their crystal structure. Cyclic voltammetry shows that the [Mo2O6(C2O4)2]4? anion can be reduced in both aprotic solvent and water.

Auteur(s) : Bougar Sarra,?, Abdou Mbayeb, Cheikh A.K. Diopa, Mamadou Sidibea, Frederic Melinc,?, Petra Hellwigc, Francis Mauryd, Francois Senocqd, Philippe Guionn
Pages : 84–92
Année de publication : 2019
Revue : Inorganica Chimica Acta
N° de volume : 491
Type : Article
Mise en ligne par : SIDIBE Mamadou