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Colourless single crystals of β-SrNCN were grown from reactive iodide/cyanide/azide fluxes in tantalum containers and structurally characterized by X-ray diffraction. Trigonal β-SrNCN is isotypic with CaNCN and contains alternating layers of strontium cations and linear NCN2− anions oriented perpendicular to the layers. The Sr cations are octahedrally coordinated by carbodiimide N atoms, with Sr—N = 2.623 (2) Å and C=N = 1.232 (5) Å. Sr, C and N atoms have site symmetries of 3m, 3m and 3m, respectively.
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Liao et al. (2004) studied this question.
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