Abstract
AbstractRare earth carbodiimide silicates RE2(CN2)(SiO4) with RE = Y, La, and Pr were synthesised by solid state metathesis reactions of RECl3, Li2(CN2), and SiO2 or Li2SiO4, respectively, in silica tubes at 550 °C. All three compounds crystallise with different structures, although all of them represent distorted derivatives of the sodium chloride type structure. The structure of Y2(CN2)(SiO4) was refined monoclinically (C2/m, Z = 2, a = 1301.382(5) pm, b = 377.630(1) pm, c = 527.656(2) pm, β = 93.9816(2) °) from X‐ray powder data. The crystal structure of La2(CN2)(SiO4) was refined in a different monoclinic space group (P21/c, Z = 4, a = 660.3(1) pm, b = 1282.0(2) pm, c = 656.2(1) pm, β = 105.23(2) °), and the structure of Pr2(CN2)(SiO4) was refined triclinically (P\bar{1}, Z = 2, a = 646.7(2) pm, b = 669.2(2) pm, c = 671.8(2) pm, α = 86.18(3) °, β = 73.22(3) °, γ = 74.08(3) °) from X‐ray single crystal data.
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