ChemInform Abstract: Sheets of La₆(C₂) Octahedra in Lanthanum Carbide Chlorides — Undulated and Plane.

Abstract

Lanthanum I 2700Sheets of La6(C2) Octahedra in Lanthanum Carbide Chlorides -Undulated and Plane. -The new compounds La 8 (C 2 ) 4 Cl 5 (I), Ce 8 (C 2 ) 4 Cl 5 (II), La 14 (C 2 ) 7 Cl 9 (III), La20(C2)10Cl13 (IV), La22(C2)11Cl14, (V), La36(C2)18Cl23 (VI), and La2(C2)Cl (VII) are synthesized from mixtures of Ln, LnCl3 (Ln: La, Ce), and C (Ta ampules, Ar, 970-1080°C, 80% yield (III), 10% yield (IV) and (V)) and characterized by powder and single crystal XRD. Compounds (I), (II), (IV), and (VI) crystallize in the monoclinic space group P2 1 /c with Z = 2 and (V) in the same space group with Z = 1. Compound (III) crystallizes in the monoclinic space group Pc with Z = 2, and (VII) in the monoclinic space group C2/c with Z = 4. The structures contain distorted C2 centered La octahedra forming chains by edge sharing. Three and four such chains join into ribbons, which are connected into undulated layers with Cl atoms between them. -(MATTAUSCH*, H.; SIMON, A.; KIENLE, L.; KOEHLER, J.; HOCH, C.; NUSS, J.; Z. Anorg. Allg.