Syntheses, Crystal Structures, and Dipole Moments of Zinc Halide Complexes with Methylurea and Dimethylacetamide

Reaction of zinc halides with methylurea (MeUr) in 1 : 2 ratio in aqueous solution results in formation of new coordination compounds [Zn(MeUr)₂Cl₂], [Zn(MeUr)₂Br₂], and [Zn(MeUr)₂I₂]. The new coordination compounds have been isolated and studied by X-ray powder diffraction, IR spectroscopy, and single-crystal X-ray diffraction. The structure of previously unknown polymorphic modification of zinc bromide complex with dimethylacetamide (DMA) [Zn(DMA)₂Br₂] has been studied. The complexes have molecular tetrahedral structure. The dipole moments of the zinc halide complexes with methylurea and dimethylacetamide have been calculated to be of 9.3–9.7 D and 6.6–8.2 D, respectively.