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The 14 carbides Ln 3.67 MnC 6  (Ln = La-Nd) and Ln 3.67 TC 6  (Ln = La-Nd, Sm; T = Fe, Ru) were prepared from the elemental components by arc-melting and subsequent annealing. Eu 3.16 NiC 6  was obtained from a lithium flux. The crystal structures of these nearly isotypic, hexagonal compounds (P6 3 /m, Z = 2) were determined from single-crystal X-ray data; La 3.67-  FeC 6 : a = 878.7(2), c = 535.1(1) pm, R = 0.052 for 548 structure factors and 25 variable parameters; Eu 3.16 NiC 6 : a -860.0(1), c = 548.2(2) pm, R = 0.015 for 606 structure factors and 25 variables. The structures differ from the previously reported Gd 3 Mn 2 C 6  structure by the occupancy of one manganese position by rare earth atoms. Since the lanthanum atoms are larger than the manganese atoms, only two thirds of these manganese positions can be occupied by the lanthanum atoms in La 3.67 FeC 6 . Eu 3.16 NiC 6  has similar atomic positions. The C-C bond distances in the C 2  pairs are 130(2) and 126.5(5) pm in the La and Eu compounds, respectively. Magnetic susceptibility measurements with a SQUID magnetometer indicate La 3.67 FeC 6  to be Pauli paramagnetic. A test for superconductivity was negative down to 3 K.

Preparation and Crystal Structure of the Isotypic Carbides Ln 3.67 TC 6 (Ln = rare earth elements; T = Mn, Fe, Ru) and Eu 3,16 NiC 6