A series of organopolymolybdate polymers linked by dual fuses: metal–organic moiety and organic ligand through Mo–N bonds

Abstract

Three organopolymolybdate polymers, [Cu₂(bte)₂(H₂O)(γ-Mo₈O₂₆)_0.5] (1) (bte = 1,2-bis(1,2,4-triazol-1-yl)ethane), [Cu(btb)₂(H₂O)(γ-Mo₈O₂₆)_0.5]·2H₂O (2) (btb = 1,4-bis(1,2,4-triazol-1-y1)butane), and [Cu(bbtz)(H₂O)₂(γ-Mo₈O₂₆)_0.5] (3) (bbtz = 1,4-bis(1,3,4-triazol-1-ylmethyl)benzene), were hydrothermally synthesized and structurally characterized. In compound 1, binuclear circles are exhibited, linked by [γ-Mo₈O₂₆]⁴⁻ anions to construct one dimensional (1D) chains which connect with each other by Mo–N bonds to form two dimensional (2D) layers. These layers are linked through bte ligands to construct a three dimensional (3D) framework. In compound 2, two kinds of lines, inorganic lines [Cu1(γ-Mo₈O₂₆)]²ⁿ⁻ and metal–organic lines [Cu2(btb)]²ⁿ⁺, are connectd to form a chain which is further reinforced by btb ligands through Mo–N and Cu1–N bonds, respectively. By sharing the Cu1 ions, these chains construct 2D layers, which are further fused by bi-dentate btb ligands to form a 3D framework. Compound 3 shows a 1D chain, in which the [γ-Mo₈O₂₆]⁴⁻ anions and binuclear circles arrange alternately linked by Cu–O bonds. The linkages are further strengthened by Mo–N bonds. The dual fuses for linking polymolybdate anions, metal–organic moiety and organic bis(triazole) ligand, are discussed in detail.