Experimental

R factor = 0.071; wR factor = 0.232; data-to-parameter ratio = 12.9. The novel pentaborate with a transition-metal complex as counter-cation and with water of crystallization, tris(ethyl-enediamine)cobalt(II) bis[4,40,6,60-tetrahydroxy-2,20-spirobi-(cyclotriboroxane)(1)] dihydrate, [Co(C2H8N2)3][B5O6-(OH)4]22H2O, forms a three-dimensional supramolecular framework through O—H O 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 = ethylenedia-mine) and water molecules are located. The crystal packing is consolidated by additional O—H O and N—H O hydrogen bonds. Related literature For related structures, see: Liu et al. (2006); Sung et al. (2000)