Structuring effects of [Ln6O(OH)8(NO3)6(H2O)12]2+ entities

In order to obtain highly porous lanthanide-based coordination polymers we are currently investigating reactions between [Ln6O(OH)8(NO3)6(H2O)12]2+ di-cationic hexanuclear entities and sodium salts of benzene-poly-carboxylic acids. Two new coordination polymers obtained during this study are reported here. In both cases, the hexanuclear entity has been destroyed during the reaction. However the resulting compounds are original thanks to a structuring effect of the poly-metallic complex. The first compound of chemical formula [Y2(C8H4O4)3(DMF)(H2O)],2DMF crystallizes in the monoclinic system, space group P121/n (n°14) with a = 16.0975(3) Å, b = 14.4605(3) Å, c = 17.7197(4) Å, β = 92.8504(9)° and Z = 4. The second compound of chemical formula Y2(NO3)2(C10H2O8)(DMF)4 crystallizes in the triclinic system, space group P-1 (n°2) with a = 7.5312(3) Å, b = 9.0288(3) Å, c = 13.1144(6) Å, α = 92.6008(14)°, β = 94.9180(14)°, γ = 112.1824(16)° and Z = 2. Both crystal structures are 2D. Both crystal structures are described and the original structural features are highlighted and related to a potential structuring effect of the hexanuclear precursor.