Hexaaquamagnesium(II) bis[4-(3-ethoxy-2-hydroxybenzylideneamino)-3-methylbenzenesulfonate]

In the title compound, [Mg(H2O)6](C16H16NO5S)2, the Mg2+ ion (site symmetry 2) adopts an almost regular octahedral coordination geometry. The anion is stabilized by an intramolecular O—H⋯N hydrogen bond, generating an S(6) ring, and the dihedral angle between the aromatic rings is 41.02 (7)°. In the crystal, the cations and anions are linked by O—H⋯O hydrogen bonds, generating sheets lying parallel to (100).

In the title compound, [Mg(H 2 O) 6 ](C 16 H 16 NO 5 S) 2 , the Mg 2+ ion (site symmetry 2) adopts an almost regular octahedral coordination geometry. The anion is stabilized by an intramolecular O-HÁ Á ÁN hydrogen bond, generating an S(6) ring, and the dihedral angle between the aromatic rings is 41.02 (7) . In the crystal, the cations and anions are linked by O-HÁ Á ÁO hydrogen bonds, generating sheets lying parallel to (100).

Comment
Schiff bases play an important role in the field of bioinorganic chemistry because they have remarkable wide biological and pharmacological activities, such as antitumor, antidiabetic, antitubercular activities [Tai, et al., 2003;Qiu, et al., 2008].
Therefore, investigating the synthesis and proper ties of hydrazone of these compounds seems to be a very interesting problem. as one part of our systematic work, In this paper, we report on the synthesis and crystal structure of the title compound, (I), (Scheme I).

Experimental
A solution of 1.0 mmol 3-ethoxysalicylaldehyde was added to a solution of 1.0 mmol 4-amino-3-methyl-benzenesulfonic acid in 5 ml 95% ethanol at room temperature. The mixture was refluxed for 4 h with stirring, then the resulting precipitate was filtered, washed, and dried in vacuo over P 4 O 10 for 48 h. Colourless blocks of (I) were obtained by slowly evaporating from methanol at room temperature. Fig. 1. The molecular structure of (I) showing 30% displacement ellipsoids.

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.