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Journal of Structural Chemistry

2012 year, number 3

structure of complex salts [Co(NH3)6][Rh(NO2)6] and [Co(NH3)6][(NO2)3Rh(Ој-NO2)1+x(Ој-OH)2-xRh(NO2)3]·(2-x)(H2O), x = 0.17

A. I. Gubanov, N. V. Kuratieva, E. Y. Filatov, S. V. Korenev
Keywords: rhodium, cobalt, complex salt, single crystal, powder X-ray diffraction study, coordination ion stabilization
Pages: 508-514

Abstract

The structures of two salts [Co(NH3)6][Rh(NO2)6] (I) and [Co(NH3)6][(NO2)3Rh(μ-NO2)1+x(μ-OH)2-x Rh(NO2)3]·(2-x)(H2O), x = 0.17 (II) are solved. Single crystals of the salts are obtained by the counter diffusion method through the gel of aqueous solutions of [Co(NH3)6]Cl3 and Na3[Rh(NO2)6]. The structure of [Co(NH3)6][Rh(NO2)6] is consistent with the diffraction data for a polycrystalline sample of poorly soluble fine salt formed in the exchange reaction between aqueous solutions of [Co(NH3)6]Cl3 and Na3[Rh(NO2)6]. The structure of [Co(NH3)6][(NO2)3Rh(μ-NO2)1+x(μ-OH)2-xRh(NO2)3]·(2-x)(H2O), x = 0.17 exhibits the stabilizing effect of a large cation in the formation of novel, unknown previously coordination ions: [(NO2)3Rh(μ-NO2)(μ-OH)2Rh(NO2)3]3- and [(NO2)3Rh(μ-NO2)2(μ-OH)Rh(NO2)3]3-.