Abstract
The compound Gd 3Cl 6N is prepared as colorless moisture-sensitive crystals by reacting GdN and GdCl 3 between 880 and 1020 K (temperature of peritectic decomposition) in tantalum containers. The structure (triclinic, P1̄, a = 710.7(1) pm, b = 815.6(1) pm, c = 970.7(1) pm, α = 75.37(2)°, β = 109.10(1)°, γ = 114.64(1)°; R = 0.03 for 3850 observed reflections) is characterized by Gd 6N 2 units formed from two edge-sharing Gd 4N tetrahedra. The coordination of the Gd 3+ ions is approximately tricapped trigonal prismatic. The structure of Gd 3Cl 6N bears close relationships to that of Gd 2Cl 3N which contains infinite chains of edge-sharing Gd 4N tetrahedra. The structures are analysed with the aid of bond length-bond strength calculations.
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