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X-ray powder diffraction characterization of the series Sr2LnTaCu2O8, Ln = Nd, Sm, Eu, Gd has been performed. The crystal structure of Sr2SmTaCu2O8 has been refined from the laboratory X-ray powder data.
metal-organic compounds
The title compound, (C4H12N)4[Ta6Cl18]Cl, crystallizes in the cubic space group 
. The crystal structure contains two different types of coordination polyhedra, i.e. four tetrahedral [(CH3)4N]+ cations and one octahedral [(Ta6Cl12)Cl6]3- cluster anion, and one Cl- ion. The presence of three different kinds of Cl atoms [bridging (![[mu]](/logos/entities/mu_rmgif.gif)
2), terminal and counter-anion] in one molecule makes this substance unique in the chemistry of hexanuclear halide clusters of niobium and tantalum. The Ta6 octahedron has an ideal Oh symmetry, with a Ta-Ta interatomic distance of 2.9215 (7) Å.
. The crystal structure contains two different types of coordination polyhedra, i.e. four tetrahedral [(CH3)4N]+ cations and one octahedral [(Ta6Cl12)Cl6]3- cluster anion, and one Cl- ion. The presence of three different kinds of Cl atoms [bridging (2), terminal and counter-anion] in one molecule makes this substance unique in the chemistry of hexanuclear halide clusters of niobium and tantalum. The Ta6 octahedron has an ideal Oh symmetry, with a Ta-Ta interatomic distance of 2.9215 (7) Å.
