A new cadmium coordination polymer based on 4-amino-4H-1,2,4-triazole

A new cadmium coordination polymer, poly[bis-(4-amino-4H-1,2,4-triazolium) [bis-(μ₂-4-amino-4H-1,2,4-triazole-κ²N¹:N²)tetra-μ₂-chlorido-tetra-chlorido-tri-cad-mium(II)] dihydrate], {(C₂H₅N₄)₂[Cd₃Cl₈(C₂H₄N₄)₂]·2H₂O} , was synthesized by the reaction of 4-amino-4H-1,2,4 triazole with cadmium(II) chloride in aqueous solution. With an unusual architecture, the crystal structure exhibits two distorted octa-hedral coordinations of Cd^II joined by edge sharing. The first is composed by four chlorine and two N atoms from the triazole ligands. The second is formed by five Cl atoms and by one N atom from the triazole ligand. The charge of the resulting two-dimensional anionic framework is balanced by the organic triazole cations. The lattice water mol-ecules form a network of hydrogen bonding. N-H⋯Cl and π-π stacking inter-actions are also involved in the supra-molecular network stability.