The crystal and molecular structure of bis(diacetamide) diaquomagnesium(II) didiacetamide perchlorate

Abstract

The crystal structure of bis(diacetamide)diaquomagnesium(II) didiacetamide perchlorate, [Mg(OH 2) 2 (DA) 2](DA) 2(ClO 4) 2, has been determined from three-dimensional X-ray data. The unit cell is triclinic, space group P 1 , with dimensions a = 10.614(2) Å, b = 10.050(2) Å, c = 7.655(2) Å, α = 75.69(7)°, β = 70.49 (8)°, γ = 83.04(8)°, and Z = 1. The structure was solved by the heavy atom method and refined by block-diagonal least squares to a conventional unweighted R of 0.088. The coordination sphere about the magnesium can be described as a slightly distorted octahedron formed by the carbonyl oxygens of two diacetamide ligands in the equatorial plane and the oxygen atoms of two water molecules at the spices. In addition, two uncomplexed diacetamide molecules are hydrogen bonded to the coordinated water molecules. Other hydrogen bonds between the amide nitrogens and perchlorate oxygens cause the formation of infinite chains. Magnesium-oxygen bond distances are in the range 2.026(7) to 2.048(6) Å.