STRUCTURES OF 2 ENCAPSULATED COBALT(III) COMPLEXES CONTAINING CYCLOTRIPHOSHPHATE

The conformational and packing properties of two encapsulated cobalt(III) complexes containing cyclo-triphosphate have been investigated. Compound (I), (1,3,6,8,10,13,16,19-octaazabicyclo[6.6.6]icosane)cobalt(III) cyclo-triphosphate-water (2/7) has the trivial name cobalt(III) sepulchrate cyclo-triphosphate-water (2/7) and chemical formula [Co(sep)](P3O9).3.5H(2)O. The cation shows an lel(3) geometry very similar to those found in other sepulchrate complexes. The packing motif is given by one-dimensional chains of alternating cations and anions running along the z direction and cross-linked by hydrogen-bonded water molecules. Compound (II) is [tris(aminoethylaminomethyl)amine]tris(ethylenediamine)dicobalt(III) di(cyclo-triphosphate) octahydrate, and has the chemical formula [Co(sep')(P3O9)][Co(sep')(0.72)(en(3))(0.28)(P3O9)].8H(2)O (where sep' = C9H27N7). Pseudotranslational symmetry is found, perturbed by the substitutional disorder sep'/en(3). B-centering is therefore simulated involving the anions and water molecules. The crystal packing is similar to that found for compound (I), but the regularity of the chains is broken by the disorder.