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Free keywords:
chromium; nitridochromate; crystal structure; ELF
Abstract:
The quaternary hexanitridodichromate(V) Li(4)sr(2)[Cr2N6] was obtained by reaction of the metals with flowing nitrogen at 900 degreesC as black-shining crystals with a platy habit. The crystal structure was determined by X-ray single crystal methods (orthorhombic, Pbca; a = 914.0 pm, b = 735.4 pm, c = 1053.6 pm; Z = 4). The compound contains isolated complex anions [Cr2N6](8-) consisting of two tetrahedra CrN4 sharing a common edge. The distance Cr-Cr in the complex anion is 249.7 pm. The analysis of the Electron Localization Function (ELF) indicates bonding interactions Cr-Cr. Strontium is in a sixfold (distorted octahedral), Lithium in a distorted tetrahedral ([3 + 1]) coordination by nitrogen. According to measurements of the magnetic susceptibility the compound is diamagnetic.
