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artículo con referato
"An unusual P312 framework for the Ni(4,4′-bipyridine)(H2O)4 chain"
M.E. Díaz de Vivar, S. Baggio, M.T. Garland and R. Baggio
Acta Cryst. C 63(4) (2007) m153-m156
catena-Poly[[[tetraaquanickel(II)]-μ-4,4′-bipyridine-κ2N:N′] thiosulfate dihydrate], {[Ni(C10H8N2)(H2O)4]S2O3·2H2O}n, (I), and catena-poly[[[tetraaquanickel(II)]-μ-4,4′-bipyridine-κ2N:N′] sulfate methanol solvate monohydrate], {[Ni(C10H8N2)(H2O)4]SO4·CH4O·H2O}n, (II), are built up of {[Ni(4,4′-bipy)(H2O)4]2+}n chains (4,4′-bipy is 4,4′-bipyridine) interwoven in an unusual P31 fashion. Voids are filled by the corresponding counter-anions and solvate molecules, defining a complex three-dimensional network surrounding them. In both structures, the cationic chains evolve around a set of twofold axes passing through the NiII ions and bisecting the aromatic amines through their N (and their opposite C) atoms.
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