Acta Cryst. (2009). E65, m368  [ doi:10.1107/S1600536809007296 ]

Tris(ethylenediamine)cobalt(II) bis(tetrahydroxypentaborate) dihydrate

L. Zhao, P. Li and B. Cao

Abstract: The novel pentaborate with a transition-metal complex as counter-cation and with water of crystallization, tris(ethylenediamine)cobalt(II) bis[4,4',6,6'-tetrahydroxy-2,2'-spirobi(cyclotriboroxane)(1-)] dihydrate, [Co(C₂H₈N₂)₃][B₅O₆(OH)₄]₂·2H₂O, forms a three-dimensional supramolecular framework through O-HO hydrogen bonding among the [B₅O₆(OH)₄]^- anions with large channels along the a axis in which the templating [Co(en)₃]²⁺ cations (en = ethylenediamine) and water molecules are located. The crystal packing is consolidated by additional O-HO and N-HO hydrogen bonds.

Online 6 March 2009

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