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C.J. Wilkins, M.M. Turnbull, J.L. Wikaira
A comparison of the molecular and crystal structures of the dimethylacetamide complexes from zinc chloride, bromide, and iodide
The dimethylacetamide complexes ZnCl2(dma)2 and ZnI2(dma)2 crystallise according to the respective space groups P212121 and P21/c. The molecules of the two compounds are conformationally different through differing ligand rotations about the Zn-O bonds. These are such as to enable a molecular packing in which there is a balance of the predominant CH3--X attractions and CH3--CH3 repulsions. The bromide is P¯1 triclinic, now with two conformationally different molecules in the asymmetric unit, but its molecular packing is similar to that of the iodide, again to balance the same attractions and repulsions. Approach distances to the amide carbon atoms are discussed.
Zeitschrift für Kristallographie, Oldenbourg Wissenschaftsverlag
Print ISSN: 0044-2968
Volume: 215, 11/2000
Pages: 702