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"Two polymeric structures with a benzene-1,2,4,5-tetracarboxylato ligand acting in μ2- and μ4-bridging mode"
A.M. Atria, G. Corsini, L. González, M.T. Garland and R. Baggio
Acta Cryst. C 65(7) (2009) m241-m245
catena-Poly[[tetraaquabis(1H-pyrazole-κN2)nickel(II)] [[diaquabis(1H-pyrazole-κN2)nickel(II)]-μ-benzene-1,2,4,5-tetracarboxylato-κ2O1:O4] tetrahydrate], {[Ni(C3H4N2)2(H2O)4][Ni(C10H2O8)(C3H4N2)2(H2O)2]·4H2O}n, (I), and poly[[(μ4-benzene-1,2,4,5-tetracarboxylato-κ4O1:O2:O4:O5)octakis(1H-pyrazole-κN2)dicobalt(II)] tetrahydrate], {[Co2(C10H2O8)(C3H4N2)8]·4H2O}n, (II), are polymeric compounds crystallizing in the space group Pl, with two independent metallic cations and one benzene-1,2,4,5-tetracarboxylate (btc) anion, each lying on symmetry centres. Individual coordination polyhedra are regular and the main differences are in the way the btc anion binds [μ2 in (I) and μ4 in (II)], promoting a ‘chain-like’ one-dimensional structure in (I) and a ‘sieve-like’ two-dimensional motif in (II).
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