Abstract
AbstractY4O2(CN2)3Cl2 and some isotypic rare earth (RE) carbodiimides RE4O2(CN2)3Cl2 (RE = Sm, Gd, Tb) were prepared by solid-state metathesis reaction between RECl3, REOCl and Li2CN2. The crystal structure of Y4O2(CN2)3Cl2 was solved and refined from single-crystal XRD data with the monocline space group C2/m. Homologous compounds with RE = Sm, Gd, Tb were assigned isotypically by means of XRD powder diffraction. The structure of Y4O2(CN2)3Cl2 is characterized by one-dimensional cluster chains which are showing a striking resemblance to the trans-edge bridging RE6-octahedra in the structures of Y2Cl3, β-Y2Cl3N, and RE2N(CN2)Cl, despite different numbers of cluster electrons. Crystals of RE4O2(CN2)3Cl2 appear as transparent rods. The presence of (NCN)2− ions is confirmed by infrared spectroscopy. Y4O2(CN2)3Cl2, doped with Ce3+ is a photoluminescent material that is showing an emission band in the orange region (λ = 550 nm) of the visible spectrum.
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