Rare Earth Carbodiimide Silicates: RE2(CN2)(SiO4)

• Published in: ZAAC - Journal of Inorganic and General Chemistry Vol. 636; no. 6; pp. 991 - 995
• Main Authors: Kubus, Mariusz, Glaser, Jochen, Kłonkowski, Andrzej, Meyer, H.-Jürgen
• Format: Book Review Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag 01.05.2010; WILEY‐VCH Verlag; Wiley-VCH Verlag
• Subjects: Carbodiimides; Metathesis; Rare earths; Silicates; Structure elucidation; X-ray diffraction; Physical Sciences
• ISSN: 0044-2313; 1521-3749
• DOI: 10.1002/zaac.201000013

Rare 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.