catena-Poly[(dichloridozinc)-µ-4,4'-bis-[(1H-imidazol-1-yl)meth-yl]biphenyl-κ(2)N(3):N(3')].

In the title compound, [ZnCl(2)(C(20)H(18)N(4))](n), the Zn(II) ion lies on a twofold rotation axis and is four-coordinated in a tetra-hedral geometry defined by two Cl anions and two N atoms from two 4,4'-bis-[(imidazol-1-yl)meth-yl]biphenyl ligands. The mid-point of the ligand is located on an inversion center, and shows a trans conformation. The ligands link the Zn(II) ions, forming a chain structure along [10-1].

catena-Poly[(dichloridozinc)-µ-1-{4-[(1H-imidazol-1-yl)meth-yl]benz-yl}-1H-imidazole-κ(2)N(3):N(3')].

The asymmetric unit of the title compound, [ZnCl(2)(C(14)H(14)N(4))](n), contains a Zn(II) ion situated on a twofold rotation axis and one-half of a 1-{4-[(1H-imidazol-1-yl)meth-yl]benz-yl}-1H-imidazole (L) ligand with the benzene ring situated on an inversion center. The Zn(II) ion is coordinated by two chloride anions and two N atoms from two L ligands in a distorted tetra-hedral geometry. The L ligands bridge ZnCl(2) fragments into polymeric chains parallel to [20-1].