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Stabilization of béta-octamolybdate with large counterions

Two new organic-inorganic compounds [H2NC(N(CH3)2)2]4[Mo8O26]$2H2O (1) and (C6H11NH3)4[Mo8O26] (2) have been synthesized at room temperature and characterized by single-cristal X-ray diffraction, thermal and elemental analyses. We show that the b-[Mo8O26]4 isomer can be stabilized by counterions which are either small or large. This observation is contradictory to the common rule which states that the b isomer should be stabilized by small counterions. Thus, we show that the organic counterion in both compounds (1) and (2) are large, but its ammonium group stabilize the b form owing to its localization in a specific nucleophilic site.

Auteur(s) : A. B. Kama, R. Dessapt, H. Serier-Braul, M. Sidibé, C. A. K. Diop, R. Gautier
Pages : 798 - 702
Année de publication : 2017
Revue : Journal of Molecular Structure
N° de volume : 1141
Type : Article
Mise en ligne par : SIDIBE Mamadou