Two new 1-D lanthanide selenidogermanates with the [Ge2Se6]4− anion as a bridging ligand to a lanthanide complex cation
Two new 1-D lanthanide selenidogermanates [Ln2(tepa)2(μ-OH)2(μ-Ge2Se6)]n·xnH2O (Ln = Tb (1), x = 0.5; Ln = Tm (2), x = 0; tepa = tetraethylenepentamine) have been solvothermally synthesized and structurally characterized. Compounds 1 and 2 contain 1-D polymeric chains [Ln2(tepa)2(μ-OH)2(μ-Ge2Se6)]n constructed by a [Ge2Se6]4− anion as a bridging ligand with trans terminal Se atoms linking [Ln2(μ-OH)2(tepa)2]4+ complex cations, but the stacking patterns of these neutral chains are different. The 1-D chains of 1 are alternately stacked in a crossing manner, while the infinite chains of 2 are arranged in a parallel manner. Although a few lanthanide selenidogermanates containing the [Ge2Se6]4− anion have been reported, their [Ge2Se6]4− anions are usually discrete. Compounds 1 and 2 provide the rare example of [Ge2Se6]4− anion as a bridging ligand to a lanthanide complex cation. Their optical and magnetic properties have also been studied.
