Received 19 November 2012
The structure of the title compound, [Co(NO2)2(NH2CH2CH2NH2)2][Co(NO2)4(NH2CH2CH2NH2)]·H2O, was redetermined with a modern CCD-equipped diffractometer. In comparison with the original determination based on photographic data [Kushi et al. (1976). Inorg. Nucl. Chem. Lett. 12, 629-633], the current study allows the location of reliable postions for the H atoms and thus leads to better understanding of the interionic and intermolecular interactions. The crystal structure consists of an octahedrally coordinated cationic CoIII complex ion, an octahedrally coordinated anionic CoIII complex ion and a lattice water molecule. The complex cation, complex anion and lattice water molecule are connected by an intricate network of O-HO and N-HO hydrogen bonds, forming a three-dimensional structure.
For background to CoIII complexes, see: Angelici (1969); Bernal (1985); Bernal & Kauffman (1987); Murmann (1955). For a previous report of the crystal structure of the title compound, see: Kushi et al. (1976). For synthetic details, see: Bailor & Rollinson (1946); Sharrock (1980). For a description of the Cambridge Structural Database, see: Allen (2002).
Data collection: APEX2 (Bruker, 2012); cell refinement: SAINT (Bruker, 2012); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: DIAMOND (Brandenburg, 2009); software used to prepare material for publication: publCIF (Westrip, 2010).
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: WM2706 ).
Financial support from the Conselho Nacional de Desenvolvimento Científico (CNPq, Brazil; grants 485245/2007-8 and 479747/2009-1), the Fundação de Amparo à Pesquisa (FAPERGS, Rio Grande do Sul; grant 10/1645-9) is gratefully acknowledged, as are fellowships from CNPq (JRMV & RAB; grant 308731/2009-3) and the Coordenação de Aperfeiçoamento de Pessoas de Nível Superior (CAPES, Brazil; JRMV). The diffractometer was funded by a CT-INFRA grant from the Financiadora de Estrutos e Projetos (FINEP, Brazil).
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