Three 3D hybrid networks based on octamolybdates and different Cu I/Cu II-bis(triazole) motifs

Abstract

Three 3D compounds based on octamolybdate clusters and various Cu I/Cu II-bis(triazole) motifs, [Cu I 2btb][ β-Mo 8O 26] 0.5 ( 1), [Cu I 2btpe][ β-Mo 8O 26] 0.5 ( 2), and [Cu II(btpe) 2][ β-Mo 8O 26] 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-[Mo 8O 26] 4− clusters via coordinating to Cu I cations giving a 3D structure. In 2, the copper(I)-btpe motif exhibits a “stairs”-like [Cu I 2btpe] 2+ sheet, and the tetradentate β-[Mo 8O 26] 4− clusters interact with two neighboring [Cu I 2btpe] 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-[Mo 8O 26] 4− clusters forming a 3D framework. The thermal stability and luminescent properties of 1– 3 are investigated in the solid state.