Three 3D octamolybdate-based hybrids with 1D–3D CuI/CuII-bis(triazole) motifs: influence of the amount of Et3N

Abstract

Three three-dimensional (3D) compounds constructed from octamolybdate clusters and 1D–3D Cu^I/Cu^II-bis(triazole) motifs, [Cu^I₄(btx)₄][β-Mo₈O₂₆] (1), [Cu^I₄(btx)₂][β-Mo₈O₂₆]·H₂O (2), and [Cu^II₂(btx)₄][α-Mo₈O₂₆] (3) [btx = 1,6-bis(1,2,4-triazol-1-yl)hexane], were hydrothermally synthesized in the presence of different amounts of reducing agent Et₃N. The crystal structures have been determined by X-ray diffraction. In 1, the copper(I)-btx motif is a 1D meso-helix chain which is further linked by hexadentate β-[Mo₈O₂₆]⁴⁻clustersvia coordinating to Cu^I cations to achieve an intricate 3D structure. In 2, the copper(I)-btx motif exhibits a 2D grid sheet, and the hexadentate β-[Mo₈O₂₆]⁴⁻clusters interact with neighboring sheets to construct a 3D structure. In 3, the copper(II)-btx motif possesses a 3D (4,4)-connected framework with the (6⁵.8)(6⁴.8²) topology, which is further connected by the tetradentate α-[Mo₈O₂₆]⁴⁻clusters forming a 3D self-penetrating (4,6)-connected hybrid network. The thermal stability and luminescent properties of 1–3 are investigated in the solid state.