A new one-dimensional NiII coordination polymer with a two-dimensional supramolecular architecture

The NiII cation is coordinated by three N atoms of three different 1,3,5-tris(imidazol-1-ylmethyl)benzene ligands, one O atom of an ethane-1,2-diol molecule, by a sulfate anion and a water molecule, forming a distorted octahedral NiN3O3 coordination geometry. The tripodal 1,3,5-tris(imidazol-1-ylmethyl)benzene ligands link the NiII cations to generate a metal–organic chain running along [100].

Hydrothermal (solvothermal) synthesis is an effective method for the construction of new metal-organic coordination polymers because it can provide ideal conditions for crystal growth due to the enhanced transport ability of solvents in superheated systems. In the present work, we carried out the solvothermal reaction between NiSO 4 Á6H 2 O ISSN 2056-9890 and imidazole-containing multidentate ligands, 1,3,5-tris-(imidazol-1-ylmethyl)benzene (timb) and successfully obtained a new Ni II one-dimensional coordination polymer, {[Ni(SO 4 )(C 18 H 18 N 6 )(C 2 H 6 O 2 ) 0.5 (H 2 O)]ÁC 2 H 6 O 2 ÁH 2 O} n , (I).
Herein we report its crystal structure and its elemental and IR spectroscopic analysis data.

Figure 2
The one-dimensional polymeric chain along the [010] direction. The 17membered (A) and 24-membered (B) macrocyclic rings are indicated.

Supramolecular features
In the crystal structure of the title compound, the abovementioned neighbouring chains are further connected to each other by O water -HÁ Á ÁO sulfate hydrogen bonds (O1W-H1WBÁ Á ÁO2 iii ), giving rise to a two-dimensional supermolecular structure running parallel to (001) plane (Fig. 3).

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.