Neue Gadoliniumcarbidbromide: Gd₂C₂ Br₂ / New Gadolinium Carbide Bromides: Gd₂C₂ Br₂ and Gd₂CBr₂

Abstract

Abstract The new compounds Gd 2 C 2 Br 2 , Gd 2 Br 2 and Gd 6 C 2 Br 7 are formed from GdBr 3 with Gd and carbon at 1170 to 1320 K. The crystal structures contain condensed Gd octahedra, which are filled with either C 2 -groups or carbon atoms. (Gd 2 C 2 Br 2 : monoclinic, C2/m; a = 702.5(2), b = 383.61(9), c = 986.8(3) pm; β = 94.47(2)°; R = 0.063 for 330 independent reflections. Gd 2 CBr 2 : trigonal, twinned, P3 ml; a = 382.09(7), c = 982.4(4) pm; R = 0.074 with 123 independent reflections.