Elsevier, Journal of Molecular Structure, 1-3(832), p. 156-163
DOI: 10.1016/j.molstruc.2006.08.028
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The compounds [Co(NH3)(6)]Br-2(BF4) 1 and [Co(NH3)(6)]Cl-2(HC2O4)center dot H2O 2 have been prepared and structurally characterised. The two crystallographically independent cations in I are involved in different hydrogen bonding patterns, with one forming predominantly N-H center dot center dot center dot F interactions with the tetrafluoroborates and the other forming N-H center dot center dot center dot Br hydrogen bonds. The supramolecular structure of 2 shows unusual hydrogen oxalate-water chains in addition to N-H center dot center dot center dot O and N-H center dot center dot center dot Cl interactions. An analysis of crystal structures containing [Co(NH3)(6)](3+) and mixed anions reveals that multiple hydrogen bonds between cations and anions can lead to both face- and edge-capping of the [Co(NH3)(6)](3+) octahedron. (c) 2006 Elsevier B.V. All rights reserved.