Construction of three new mixed-ligand Zn(II) coordination polymers based on nitrogen-containing heterotopic ligands and carboxylate co-ligands

• Three new mixed-ligand Zn(II) coordination polymers were constructed.
• Compound 1 is a 3D (3,4)-connected framework with InS topology.
• Compound 2 has 2D bilayer structure with new 4-nodal (3,4)-connected topology.

Reactions of Zn(II) salts, presynthesized 5-(4-(1H-imidazol-1-yl)phenyl)-1H-tetrazolate (HIPT) and various carboxylate ligands result to three new coordination polymers (CPs), namely, [Zn2[(IPT)2(ox)]}n (H2ox = oxalic acid, 1), [Zn2(IPT)2(mNBDC)]n (H2mNBDC = 5-nitroisophthalic acid, 2), and [Zn2(IPT)(CA)(H2O)]n (H3CA = citric acid, 3). Compound 1 can be seen as constructed from 2D [Zn(IPT)]n layers with (6,3) topology and pillared by ox2 −. It is a 3D (3,4)-connected framework with InS topology. Compound 2 has 2D bilayer structure based on 2D [Zn(IPT)]n single layer and mNBDC2 − linkers. Compound 3 is a 3D pillar-layer framework built by Zn–CA bilayers and IPT− pillars. The results showed that the coordination modes, configurations of IPT−, and the structure of carboxylate co-ligands have great influence on the structures of the final network. The choice of carboxylate can decide the result of CPs in Zn–IPT chains/net subunits plus carboxyl linkers or Zn–carboxylate chains/net subunits plus IPT− linkers. The thermal stabilities and luminescent properties of selected compounds have also been studied.

Three new Zn(II) CPs with 5-(4-(1H-imidazol-1-yl)phenyl)-1H-tetrazolate (HIPT) and various carboxylate ligands were constructed. They display diverse structures and luminescent properties.Figure optionsDownload as PowerPoint slide