Abstract
AbstractSingle crystals of the, basically, four‐layer slab structure …︁ClLuLuCl…︁ of the apparently as such nonexisting lutetium monochloride, LuCl, stabilized by interstitial hydrogen or carbon have been obtained from reactions of LuCl3 and cesium (LuClHx, due to ubiquitous hydrogen) and CsCl, lutetium and carbon (Lu2Cl2C), respectively, in sealed tantalum containers at elevated temperatures (above 700°C). Both exhibit so‐called 3R structures (space group R3m): LuClHx (a = 363.83(3), c = 2710.2(3) pm, Z = 6) crystalizes with the ZrCl type structure with hydrogen in tetrahedral interstices and Lu2Cl2C (a = 360.17(3), c = 2716.0(3) pm, Z = 3) with the tetradymite type (Bi2Te2S) with carbon in octahedral interstices between the double metal layers. Power X‐ray diffraction shows that for Lu2Cl2C a 1T structure is also adopted (a = 359.72(3), c = 909.25(9) pm, p3m1, Z = 1).
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