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Sr4N[CN2][C2N]: The First Carbodiimide Acetonitriletriide

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Jach,  Franziska
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Höhn,  Peter
Peter Höhn, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Prots,  Yurii
Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Ruck,  Michael
Michael Ruck, Max Planck Fellow, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Jach, F., Höhn, P., Prots, Y., & Ruck, M. (2019). Sr4N[CN2][C2N]: The First Carbodiimide Acetonitriletriide. European Journal of Inorganic Chemistry, (9), 1207-1211. doi:10.1002/ejic.201801242.


Cite as: http://hdl.handle.net/21.11116/0000-0003-36FF-2
Abstract
The acetonitriletriide anion C2N3-, the fully deprotonated form of acetonitrile, is stabilized in a pure alkaline earth metal environment in Sr4N[CN2][C2N]. The heterogeneous reaction of graphite and elemental nitrogen (from decomposed NaN3) with Sr2N at 1020 K yields for the first time a phase that contains the two triatomic anions acetonitriletriide C2N3- and carbodiimide CN22- side by side. Further synthetic routes were likewise successfully tested, including a sodium free approach (Sr2N + C) and the use of NaCN as carbon and nitrogen source. The monoclinic crystal structure is derived from powder and single-crystal X-ray diffraction data (P2(1)/c, a = 397.74(1) pm, b = 1411.72(3) pm, c = 692.57(1) pm, beta = 103.57(1)degrees, Z = 2). The existence of both anions in Sr4N[CN2][C2N] is further confirmed by IR and Raman spectroscopy. With its novel 1-D chain structure of edge-sharing NSr6 octahedra, the material also enriches the structural variety of ternary alkaline earth metal nitrides.