Three 3D hybrid networks based on octamolybdates and different CuI/CuII-bis(triazole) motifs

Three 3D compounds based on octamolybdate clusters and various CuI/CuII-bis(triazole) motifs, [CuI2btb][β-Mo8O26]0.5 (1), [CuI2btpe][β-Mo8O26]0.5 (2), and [CuII(btpe)2][β-Mo8O26]0.5 (3) [btb=1,4-bis(1,2,4-triazol-1-yl)butane, btpe=1,5-bis(1,2,4-triazol-1-yl)pentane], were isolated via tuning flexible ligand spacer length and metal coordination preferences. In 1, the copper(I)-btb motif is a one-dimensional (1D) chain which is further linked by hexadentate β-[Mo8O26]4− clusters via coordinating to CuI cations giving a 3D structure. In 2, the copper(I)-btpe motif exhibits a “stairs”-like [CuI2btpe]2+ sheet, and the tetradentate β-[Mo8O26]4− clusters interact with two neighboring [CuI2btpe]2+ sheets constructing a 3D framework. In 3, the copper(II)-btpe motif possesses a novel (2D→3D) interdigitated structure, which is further connected by the tetradentate β-[Mo8O26]4− clusters forming a 3D framework. The thermal stability and luminescent properties of 1–3 are investigated in the solid state.