The Structure of Tris(ethylenediamine)chromium(III) Hexacyanocobaltate(III) Hexahydrate, [Cr(C2H8N2)3] [Co(CN)6]•6H2O

Kenneth N. Raymond, James A. Ibers

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The structure of tris(ethylenediamine)chromium(III) hexacyanocobaltate(III) hexahydrate, [Cr(C2H8N2)3 [Co(CN)6] • 6H2O, has been determined from three-dimensional X-ray data collected by counter methods. The final R factor on F for the 1035 F2 values above σ(F2) is 9.4%, and for the 735 reflections above 3σ(F2) it is 6.1%. The material crystallizes with four molecules in space group C2h6-12/a of the monoclinic system in a cell of dimensions a = 16.745 (20), b = 10.546 (15), c = 14.331 (20) Å, β = 96.9 (1)°. The measured and calculated densities are both 1.46 g/cm3. The site symmetry at Co is 1; that at Cr is 2. The structure consists of discrete Cr(C2H8N2)33+ cations and Co(CN)63− anions. Hydrogen bonding connects the anions, cations, and water molecules. The Cr(C2H8N2)33+ cation has its expected coordination geometry. For a Λ configuration of the cation the conformation of the complex is Λλλλ. The average Cr-N, N-C, and C-C distances are 2.081 (5), 1.481 (12), and 1.489 (9) Å. The Co(CN)63− anion has its expected octahedral geometry. The average Co-C distance is 1.869 Å, although the three independent Co-C distances appear to differ slightly. The average C-N distance is 1.155 (8) Å.

Original languageEnglish (US)
Pages (from-to)2333-2338
Number of pages6
JournalInorganic chemistry
Issue number11
StatePublished - Nov 1 1968

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry


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