Hydrothermal syntheses and structures of three novel coordination polymers assembled from 1,2,3-triazolate ligands

Abstract

Three new coordination polymers with 1,2,3-triazolate ligands, [Cd₃(ta)₃Cl₃]_n (1), {[Cd₃(ta)₆]·6H₂O}_n (2) and [Cu₆(ta)₃I₃]_n (3) (Hta = 1,2,3-triazole), have been hydrothermally synthesized and structurally characterized. In complex 1, the Cd²⁺ and Cl⁻ ions form a 3D [(Cd₃Cl₃)³⁺]_n inorganic framework with (8².12)(4.8.10) topology while the Cd²⁺ ions and ta⁻ ligands give a {[Cd₃(ta)₃]³⁺}_n double helical chain. The two moieties are fused with each other by sharing “hinge” Cd²⁺ ions leading to a 3D organic–inorganic hybrid structure. The 3D porous metal–organic framework of complex 2 shows the topology of the diamond net with the Cd-centered CdCd₄ tetrahedron units as the connecting nodes. The desolvated structure of 2 has 48% solvent accessible space of the total volume. Complex 3 is an undulating 1D organic–inorganic hybrid complex consisting of interesting discrete five-capped [Cu₆I₅]⁻ triangular prism clusters and arched metallacycle [Cu₆(ta)₆I]⁺ moieties.