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Berger, Ute und Schnick, Wolfgang (1994): Syntheses, crystal structures, and vibrational spectroscopic properties of MgCN2, SrCN2, and BaCN2. In: Journal of Alloys and Compounds, Vol. 206, Nr. 2: S. 179-184




The alkaline-earth metal cyanamides MgCN* SrCN* and BaCN2 were prepared by the reaction of melamine with the metal nitrides (M&N2, Sr-jN, Ba3N2 ) at temperatures between 740 e C and 850 °C. MgCN2 was structurally characterized by X-ray analysis using powder methods (R3m, Ζ - 3 , a=327.34(1) pm, c-1412.82(5) pm). The crystal structures of SrCN2 and BaCN2 were determined from X-ray single crystal data (SrCN2 : Pnma, Ζ-A, 0-1241.0(2) pm, 6-396.3(2) pm, c-538.9(2) pm, BaCN2 : R3c, Z=18, e-1528.2(2) pm, c-70l.3(2) pm). All compounds consist of the respective cations and CN2 2~-anions with an increasing degree of distortion of the coordination polyhedra with increasing radii of the cations. The structural features are correlated with vibrational spectroscopic data.