Abstract
A procedure for preparing Li4[Ru(NO2)6]…12H2O and K4[Ru(NO2)6] is described. We have carried out an X-ray diffraction study of polycrystals (DRON-UM1 diffractometer, R=192mm, CuKα radiation, Ni filter) and single crystals (CAD-4 automatic diffractometer, MoKα radiation, graphite monochromator, ω/2ϕ scan mode). Crystal data for Li4[Ru(NO2)6]…12H2O are a=11.749(9), c=16.807(12) A, space group\(I\bar 4\), V=2320.0 A3, Z=4, dcalc=1.778 g/cm3; for K4 [Ru(NO2)6]: a=8.595(1) A, α=53.23 (2)o, space group\(R\bar 3\), V=367.0 A3, Z=1, dcalc=2.414 g/cm3. The structures are composed of [Ru(NO2)6]4− comple anions, alkaline metal cations, and crystallization water molecules. In both compounds, the coordination polyhedra of Ru are nearly regular octahedra formed by nitrite nitrogen atoms. The Ru-N bond lengths are 2.054–2.102 A. The NO2 groups have virtually the same geometric characteristics: the N−O distances are within 1.196–1.316 A and the O−N−O angles are 112.9–117.4o. The coordination environment of alkaline metals by oxygen atoms is discussed.
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