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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

Resumo

ATRIA, ANA MARÍA; GARLAND, MARÍA TERESA  e  BAGGIO, RICARDO. CATENA(HEXA-AQUA-COBALT(II) TETRA-AQUA-(M2-1,2,4,5-BENZENECARBOXYLATO-O,O') -COBALT(II) HYDRATE): A NEW SYMMETRY FOR AN OLD POLYMORPHIC PHASE. J. Chil. Chem. Soc. [online]. 2013, vol.58, n.1, pp.1576-1579. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072013000100016.

The title cobalt complex (C10H38Co2O26) consists of [Co(H2O)4(C10H2O8)]2-n anionic chains, balanced by [(Co(H2O)6]2+ cations and eight solvato water molecules, some of which are disordered. The chains are formed by Co(H2O)4 "beads" threaded by fully deprotonated benzenecarboxylato anions binding in a stretched, trans fashion, and they are linked by H-bonds into a 2D structure. The cationic groups and solvato water molecules form a second kind of 2D arrays, "sanwiched" by the latter ones and linking the lot into a 3D structure through a very complex H-bonding interaction scheme. The structure presents a very conspicuous pseudo symmetry, and it appears to be a slight polymorphic modification of an already published isologue of identical formulation but with the higher symmetry properly attained, in a volume half as large. The slight differences between both structures seems to reside mainly in the (disordered) solvates, as suggested by the overlap of both models.

Palavras-chave : crystal structure; polymorph; cobalt.

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