A novel addition complex composed of single and double chains constructed from btb–Cd–SO4 units (btb = 1,4-bis(1,2,4-triazol-1-yl)butane)

Reaction of Cd(SO4)2radical dot6H2O with 1,4-bis(1,2,4-triazol-1-yl)butane (btb) gave a novel addition complex {[Cd2(btb)2(H2O)6(SO4)][Cd(btb)(H2O)2(SO4)2]2H2O}, which was characterized by single crystal X-ray diffraction. The complex composes of 1D cationic double chain and 1D anionic single chain constructed from btb–Cd–SO4 building blocks. The single and double chains are mutually interpenetrating to construct a 3D supramolecular network by inter-chain hydrogen bonds. The fluorescence of the complex is assigned to the intraligand π⁎–π transition of the ligand.