Gd3Cu2Te7 and U2Cu0.78Te6: Two Examples of Linear Te Chains

Abstract The compounds Gd 3 Cu 2 Te 7 and U 2 Cu 0.78 Te 6 have been synthesized by reactions of the elements at 1123 K in a KI flux. Gd 3 Cu 2 Te 7 crystallizes in the orthorhombic space group Cmcm with four formula units in a cell of dimensions a =11.4994(8), b =19.170(1), and c =6.1251(4) A at T =153 K. Gd 3 Cu 2 Te 7 can be considered to consist of one-dimensional isolated Te chains and two-dimensional 2 ∞ [Cu 2 Te 5 ] layers separated by Gd atoms along the b axis. U 2 Cu 0.78 Te 6 crystallizes in the monoclinic space group P 2 1 / m with one formula unit in a cell of dimensions a =6.100(1), b =4.2150(7), c =10.365(2) A, and β =98.978(3)° at T =153 K. U 2 Cu 0.78 Te 6 contains two-dimensional 2 ∞ [UTe 3 ] layers joined by Cu atoms along the c axis. In both structures the Gd and U atoms are coordinated to bicapped trigonal prisms of eight Te atoms, and the Cu atoms are coordinated to tetrahedra of four Te atoms. Both structures contain linear Te chains.

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