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The new compounds Y 7 I 12 C 2 N and Ho 7 I 12 C 2 N have been prepared by reaction of stoichiometric amounts of the metals (RE), REI 3 , REN and C in closed Ta capsules at 1150 and 1120K, respectively. Pure samples of the compounds were obtained after 5 days annealing time. The crystals with xenomorphic shape are olive-green (Y 7 I 12 C 2 N) or red-brown (Ho 7 I 12 C 2 N) in colour and sensitive to air and moisture. Y 7 I 12 C 2 N crystallizes in the space group P 1̄ (No. 2) with lattice constants a = 971.24(7), b = 1030.38(7), c = 1673.58(11) pm and α = 101.366(5), β = 92.758(5), γ = 112.799(5)°. According to Guinier photographs Ho7I12C2N is isotypic with the lattice consiants u - 968.8(3), b = 1028.7(3), r. = 1667.8(5) pm and α = 101.31(2), β = 92.78(2), γ = 112.80(1)°.

zeitschrift für naturforschung b

Y 7 I 12 C 2 N: Eine Verbindung aus Einheiten zweier Y 6 (C 2 )-Oktaeder und eines Y 6 N 2 -Tetraederdoppels / Y 7 I 12 C 2 N: A Compound with Units of Two Y 6 (C 2 ) Octahedra and a Y 6 N 2  Double Tetrahedron