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In the structure of title compound, [Cs(2)(C(7)H(5)N(2)O(4))(2)(H(2)O)(2)](n), the asymmetric unit contains two independent Cs atoms comprising different coordination polyhedra. One is nine-coordinate, the other seven-coordinate, both having irregular configurations. The CsO(9) coordination polyhedron comprises O-atom donors from three bridging water mol-ecules, one of which is doubly bridging, three from carboxyl-ate groups, and three from nitro groups, of which two are bidentate chelate bridging. The CsO(6)N coordination polyhedron comprises the two bridging water mol-ecules, one amine N-atom donor, one carboxyl-ate O-atom donor and four O-atom donors from nitro groups (two from the chelate bridges). The extension of the dimeric unit gives a three-dimensional polymeric structure, which is stabilized by both intra- and inter-molecular amine N-H⋯O and water O-H⋯O hydrogen bonds to carboxyl-ate O-atom acceptors, as well as inter-ring π-π inter-actions [minimum ring centroid-centroid separation = 3.4172 (15) Å].

Poly[di-μ-aqua-bis(μ-2-amino-4-nitrobenzoato)dicaesium]