A new mono-functionalized organoimido hexamolybdate derivative: bis(tetra-n-butylammonium) (5-chloro-2-methylphenylimido)-μ6-oxido-dodeca-μ2-oxido-pentaoxidohexamolybdate(VI)

Abstract

The title complex, [(C4H9)4N]2[Mo6(C7H6ClN)O18], was prepared by the reaction of (Bu4N)4[α-Mo8O26] and 2-methyl-5-chloroaniline hydrochloride with N,N′-dicyclohexylcarbodiimide as dehydrating agent in dry acetonitrile solution. The arylimido ligand is linked to an Mo atom of the Lindqvist-type hexamolybdate anion by an Mo[triple-bond]N triple bond, with a bond length of 1.732 (4) Å and an Mo[triple-bond]N—C bond angle of 169.1 (4)°, typical for monodentate imido groups in such hybrid complexes. Due to the interaction between one H atom in the aryl group and an O atom of a symmetry-related hexamolybdate cluster, the anions form centrosymmetric dimers in the crystal structure. Weak C—H...O contacts are observed between the cations and anions. Unresolved disorder in some of the butyl chains of the ammonium cation is noted.