Poly[bis-[μ2-4,4'-bis-(imidazol-1-ylmeth-yl)biphenyl-κ2 N: N']di-chlorido-nickel(II)]

Abstract

In the title compound, [NiCl₂(C₂₀H₁₈N₄)₂] _n , the Ni²⁺ cation is situated on an inversion center and is coordinated by two chloride ions and four imidazole N atoms of four different 4,4'-bis-[(1H-imidazol-1-yl)meth-yl]-1,1'-biphenyl (BIMB), forming a slightly distorted octa-hedral geometry. Each BIMB ligand adopts a linear linker to connect Ni²⁺ ions, forming a two-dimensional layer with an sql network. In the crystal, neighboring layers repeat in an ABAB stacking mode, and weak inter-molecular C-H⋯Cl hydrogen bonds between alternate layers lead to a three-dimensional, twofold inter-penetrated, supra-molecular framework with a pcu topology net.

Keywords: coordination polymer; crystal structure; imidazole; nickel.

Figure 1

The coordination environment of the zinc ions and the BIMB ligands in the title compound, with displacement ellipsoids drawn at the 30% probability level. H atoms are omitted for clarity. [Symmetry codes: (A)  − x,  − y, 1 − z; (B) −x, y,  − z; (C) 1 − x, y,  − z; (D)  + x,  − y,  + z; (E) x −  ,  − y,  + z.]

Figure 2

The two-dimensional structure of the title compound with sql network viewed along the b axis.

Figure 3

The packing of the title compound viewed along the b axis. H atoms are omitted for clarity.

Figure 4

View of the C—H⋯Cl hydrogen bonds (dashed lines) between alternate layers along the c axis. H atoms not involved in hydrogen bonding are omitted.

Figure 5

The twofold inter­penetrated supra­molecular framework with a pcu topology network connected by C—H⋯Cl hydrogen bonds (shown as dashed lines).