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Acta Cryst. (2014). E70, m192-m193
[ doi:10.1107/S1600536814008861 ]


G. Smith

Abstract: In the structure of the title salt, [Rb2(C7H5N2O4)2(H2O)2]n, the asymmetric unit comprises two independent and different seven-coordinate Rb+ cations, one forming an RbO7 polyhedron, the other a RbO6N polyhedron, each of which is considerably distorted. The RbO7 polyhedron comprises bridging O-atom donors from two water mol­ecules, three carboxyl­ate groups, and two nitro groups. The RbO6N polyhedron comprises the two bridging water mol­ecules, one monodentate amine N-atom donor, one carboxyl O-atom donor and three O-atom donors from nitro groups (one from the chelate bridge). The extension of the dinuclear unit gives a three-dimensional polymeric structure which is stabilized by both intra- and inter­molecular amine N-H...O and water O-H...O hydrogen bonds to carboxyl and water O-atom acceptors, as well as a number of inter-ring [pi]-[pi] inter­actions [minimum centroid-centroid separation = 3.364 (2) Å]. The title salt is isostructural with the analogous caesium salt.

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