Three-layered close packing in the crystal structure of tris(ethylenediamine)cobalt(III) hexanitrorhodate(III) hydrate, [Co(en)3][Rh(NO2)6]·3H2O,en=C2H8N2 |
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Authors: | N. V. Podberezskaya G. V. Romanenko I. I. Tychinskaya |
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Abstract: | In the structure of cubic tris(ethylenediamine)cobalt(III) hexanitrorhodate(III) hydrate, [Co(en)3][Rh(NO2)6]·3H2O, en=C2H8N2, with a=16.540(5) Å, space group Pa3 (nonstandard, reduced to orthorhombic Pcab), the complex cations, anions, and water molecules are arranged by the law of three-layered (fcc) close packing of “quasispherical” species according to two structural types, NaCl and CaF2. The packing is formed of [Rh(NO2)6]3? anions, which also fill the octahedral voids. The tetrahedral voids are occupied by the central atoms of the [Co(en)3]3+ cations, and the H2O molecules lie between the cations, performing the packing function: the Ow...Nen contacts of 3.04 Å and the Ow..ONO 2 contacts of 3.01 Å characterize weak van der Waals interactions. The values of the interatomic distances Co?N, Rh?N, N?O, N?C, and C?C are in good agreement with the known data. |
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