A hydrogen-bonded 3D coordination network of CoII with 4-(p-benzoxy)-1,2,4-triazole: hydrothermal synthesis, characterization, crystal structure and emission property

A six-coordinated monomeric CoII complex, [Co(L)2(H2O)4]·10H2O (1), where HL=4-(p-benzoxy)-1,2,4-triazole, has been synthesized and characterized by elemental analyses, IR, thermogravimetric analysis and X-ray diffraction technique. Structural analyses reveal that the CoII center has a CoN2O4 octahedral environment with four O atoms of coordinated water molecules constituting the equatorial plane and two N atoms of two distinct L ligands occupying the two axial sites in 1. A striking structural feature of 1 resides in the formation of a three-dimensional (3D) supramolecular architecture through intermolecular O-H⋯O hydrogen-bonding interactions. Complex 1 displays strong blue emission in the solid state.