Synthesis, structures and luminescence properties of three manganese coordination polymers with bis(1,2,4-triazol-1-ylmethyl)benzene

A two-dimensional Zn coordination polymer with a three-dimensional supra-molecular architecture

The characteristic structural feature of a new two-dimensional Zn coordination polymer is an infinite polymeric layer parallel to the crystallographic (132) plane.

The title compound, poly[bis­{μ₂-4,4′-bis­[(1,2,4-triazol-1-yl)meth­yl]biphenyl-κ²N⁴:N^4′}bis­(nitrato-κO)zinc(II)], [Zn(NO₃)₂(C₁₈H₁₆N₆)₂]_n, is a two-dimensional zinc coordination polymer constructed from 4,4′-bis­[(1H-1,2,4-triazol-1-yl)meth­yl]-1,1′-biphenyl units. It was synthesized and characterized by elemental analysis and single-crystal X-ray diffraction. The Zn^II cation is located on an inversion centre and is coordinated by two O atoms from two symmetry-related nitrate groups and four N atoms from four symmetry-related 4,4′-bis­[(1H-1,2,4-triazol-1-yl)meth­yl]-1,1′-biphenyl ligands, forming a distorted octa­hedral {ZnN₄O₂} coordination geometry. The linear 4,4′-bis­[(1H-1,2,4-triazol-1-yl)meth­yl]-1,1′-biphenyl ligand links two Zn^II cations, generating two-dimensional layers parallel to the crystallographic (132) plane. The parallel layers are connected by C—H⋯O, C—H⋯N, C—H⋯π and π–π stacking inter­actions, resulting in a three-dimensional supra­molecular architecture.