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C2oH4oCl6lnOsYb, monoclinic, P\2\lc\ (no. 14), a = 7.9739(8) À, b = 17.314(2) Â, c = 22.501(2) Â, β = 91.281(1)°, V= 3105.6 Â, Z = 4, Rgl(F) = 0.033, wRreftF) = 0.088, T = 100 K. Source of material 0.28 g YbCb (0.1 mmol) and 0.22 g InCb (0.1 mmol) were added to 50 mL of tetrahydrofuran at -70 °C. Subsequently the suspension was stirred at 50 °C for 4 h. The resultant slightly pale solution was filtered and the fíltrate concentrated in vacuum. The product is obtained at 4 °C as colourless solid. A block-shaped crystal, which was selected from the cold mother solution and dispersed in a high viscous oil, was mounted onto a nylon loop for Xray diffraction. Discussion In previous studies it has been established that the abstraction of halides from several lanthanide(m)chlorides can be performed by using tin tetrachloride [1]. In the same manner antimon pentachloride is an effective halide abstractor for several metal halides [2,3]. Due to the close proximity of indium to tin and antimon in the periodic system, and the similar capabilities of indium halides, indium trichloride likewise should be a suitable halide abstractor reagent. Accordingly the reaction of InCb with YbCb in tetrahydrofuran yielded [YbChCthfMInCU]· Attempts to prepare a homoleptic compound [Yb(thf)n][InCU]3 also yielded the title compound after crystallisation. The title crystal structure contains discrete [YbCh(thf)5] cations and [InCLt] anions. The cationic moiety can be regarded as a nearly linear Cl Yb—CI unit wherein five additional tetrahydrofuran molecules are attached to the ytterbium atom to give rise to a pentagonal bipyramidal coordination sphere of the metal center. The cationic unit is very similar in structure to that of known compounds containing this structural motif [4,5]. The indium atom in the [InCUr counterion shows tetrahedral surrounding by the chlorine atoms with In—CI distances of 235.2 pm on average, which is also in good agreement with reported values [6]. Table 1. Data collection and handling. Crystal: colorless block, size 0.20 χ 0.25 χ 0.30 mm Wavelength: Mo Ka radiation (0.71073 Â) μ· 42.78 cm" Difiractometer, scan mode: Broker SMART APEX CCD, ω 20max: 54.24° Nfhklhuamtai, N(hkl)va¡que: 25589,6814 Criterion for Afe, N(hkl)g¡. /obs > 2 a(Iobs), 6485 N(param)tcfined: 298 Programs: SHELXTL [7], DIAMOND [8] Table 2. Atomic coordinates and displacement parameters (in Â).

Crystal structure of dichloropentakis(tetrahydrofurano)ytterbium(III) tetrachloroindate(III), [YbCl 2 (C 4 H 8 O) 5 ][InCl 4 ]