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

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.

Figure 1

Mol­ecular structure of the [Mo₇O₂₄]⁶⁻ hepta­molybdate cluster anion in (I).

Figure 2

The asymmetric unit of (I) with displacement ellipsoids drawn at the 50% probability level.

Figure 3

Detail of the structure of (I) showing the inter­connections of the [Mo₇O₂₄]⁶⁻ anion with its neighbours.