STRUCTURES OF 2 COBALT(III) SEPULCHRATE COMPLEXES

The complex (1,3,6,8,10,13,16,19-octbicyclo[6.6.6]icosane)cobalt(III) perchlorate thiosulfate, [Co(C12H30N8)](ClO4)(S2O3), crystallizes in the hexagonal space group P6(3)22. Cations and anions occupy special-site positions with the anions disordered as a result of symmetry requirements. Co(sep)3+ (sep = C12H30N8) adopts the optically active D3 crystallographic geometry. The packing consists of layers of interacting Co(sep)3+ and S2O32- ions, intercalated by isolated ClO4-anions. The second complex, rac-(1,3,6,8,10,13,16,19-octaazabicyclo[6.6.6]icosane)cobalt trichloride monohydrate, rac-Co(C12H30N8)]Cl3.H2O, crystallizes in the monoclinic space group P2(1)/a. There are two independent [Co(sep)]Cl3.H2O moieties present in the asymmetric unit; the two Co(sep)3+ cations have essentially identical conformations, although each one interacts differently with its three corresponding Cl- anions. The two water molecules contribute to this differentiation, bridging the [Co(sep)]Cl3 moieties in one-dimensional polymeric chains. The geometries of the cations in the two complexes are also identical.