Synthesis and crystal structure of a new hybrid organic-inorganic material containing neutral mol-ecules, cations and hepta-molybdate anions

Bougar Sarr; Abdou Mbaye; Wally Diallo; Cheikh Abdoul Khadir Diop; Mamadou Sidibe; Francois Michaud

doi:10.1107/S2056989019008454

Synthesis and crystal structure of a new hybrid organic-inorganic material containing neutral mol-ecules, cations and hepta-molybdate anions

Acta Crystallogr E Crystallogr Commun. 2019 Jun 21;75(Pt 7):1001-1004. doi: 10.1107/S2056989019008454. eCollection 2019 Jul 1.

Authors

Bougar Sarr¹, Abdou Mbaye², Wally Diallo¹, Cheikh Abdoul Khadir Diop¹, Mamadou Sidibe¹, Francois Michaud³

Affiliations

¹ Laboratoire de Chimie Minérale et Analytique, Département de Chimie, Faculté des Sciences et Téchniques, Université Cheikh Anta Diop, Dakar, Senegal.
² Laboratoire de Chimie et de Physique des Matériaux (LCPM) de l'Université Assane Seck de Ziguinchor (UASZ), BP 523 Ziguinchor, Senegal.
³ Service Commun d'Analyse par Diffraction des Rayons X, Universite de Bretagne Occidentale, 6, avenue Victor Le Gorgeu, CS 93837, F-29238 Brest cedex 3, France.

Abstract

The title compound, hexa-kis-(2-methyl-1H-imidazol-3-ium) hepta-molybdate 2-methyl-1H-imidazole disolvate dihydrate, (C₄H₇N₂)₆[Mo₇O₂₄]·2C₄H₆N₂·2H₂O, was prepared from 2-methyl-imidazole and ammonium hepta-molybdate tetra-hydrate in acid solution. The [Mo₇O₂₄]^6- hepta-molybdate cluster anion is accompanied by six protonated (C₄H₇N₂)⁺ 2-methyl-imidazolium cations, two neutral C₄H₆N₂ 2-methyl-imidazole mol-ecules and two water mol-ecules of crystallization. The cluster consists of seven distorted MoO₆ octa-hedra sharing edges or vertices. In the crystal, the components are linked by N-H⋯N, N-H⋯O, O-H⋯O, N-H⋯(O,O) and O-H⋯(O,O) hydrogen bonds, generating a three-dimensional network. Weak C-H⋯O inter-actions consolidate the packing.

Keywords: IR spectroscopic study; crystal structure; hydrogen bonding; polyoxomolybdates.