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Issue 1, 1985
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New carbide clusters in the cobalt subgroup. Part 13. Synthesis and chemical characterization of the anions [Co6C(CO)14], [Co6C(CO)15]2–, and [Co8C(CO)18]2–, and crystal structure of µ6-carbido-ennea-µ-carbonyl-hexacarbonyl-polyhedro-hexacobaltate(2–) as its benzyltrimethylammonium salt; a comparison with isostructural species

Abstract

The anions [Co6C(CO)15]2– and [Co8C(CO)18]2– have been prepared starting from compounds such as [Co3C(CO)9Cl], Na[Co(CO)4], and [Co4(CO)12], and [Co6C(CO)14] has been obtained from [Co6C(CO)15]2– by oxidation with FeCl3 or iodine. The chemistry and relationships between these anions are discussed. The molecular structure of [Co6C(CO)15]2– has been determined by single-crystal X-ray crystallography. It is monoclinic, space group C2/c, with a= 21.752(2), b= 11.350(1), c= 18.099(2)Å, β= 112.28(1)°, and Z= 4. The structure has been solved from 2 184 reflections, collected by counter methods, and refined by least-squares calculations to R= 0.074. The dianion has idealized D3d symmetry and contains a trigonal prism of cobalt atoms, whose cavity accommodates an interstitial carbon atom. The structural parameters are carefully compared with those of the isostructural anions [Rh6C(CO)15]2– and [M6N(CO)15](M = Co or Rh) to show how the metal atoms, the interstitial species, and the anionic charge affect the bond parameters.

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Article type: Paper
DOI: 10.1039/DT9850000035
Citation: J. Chem. Soc., Dalton Trans., 1985,0, 35-41
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    New carbide clusters in the cobalt subgroup. Part 13. Synthesis and chemical characterization of the anions [Co6C(CO)14], [Co6C(CO)15]2–, and [Co8C(CO)18]2–, and crystal structure of µ6-carbido-ennea-µ-carbonyl-hexacarbonyl-polyhedro-hexacobaltate(2–) as its benzyltrimethylammonium salt; a comparison with isostructural species

    S. Martinengo, D. Strumolo, P. Chini, V. G. Albano and D. Braga, J. Chem. Soc., Dalton Trans., 1985, 0, 35
    DOI: 10.1039/DT9850000035

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