Abstract
The coordination around the Sm atom in the title compound, catena-poly[[[tetraaqua-1κ 2 O,2κ 2 O-tetrakis(μ-3,5-dinitrobenzoato-O,O')disamarium]-bis(μ-3,5-dinitrobenzoato-O:O')] dihydrate], [Sm 2 (C 7 H 3 N 2 O 6 ) 6 (H 2 O) 4 ].2H 2 O, is eightfold. The irregular square-antiprism coordination of the Sm ion is provided by six O atoms from six carboxylate groups and two water O atoms. The Sm ions are bridged alternately by four and two ligands, resulting in linear polymeric chains with two different Sm…Sm distances of 4.2476(7) and 5.0831 (8) A, and Sm-O distances in the range 2.355 (4)-2.559 (4) A. A set of hydrogen bonds exists between the nitro groups and the water molecules.
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