Key indicators: single-crystal X-ray study; T = 296 K; mean (C-C) = 0.004 Å; R factor = 0.023; wR factor = 0.058; data-to-parameter ratio = 15.8.The structure of the title compound, [Sm 2 (C 4 O 4 ) 3 (H 2 O) 4 ] n , consists of infinite-chain structural units, built from edgesharing samarium SmO 7 (H 2 O) 2 polyhedra and linked via bismonodendate squarate (sq1) groups. The chains extend along [100] in a zigzag mode and are interconnected by bis-chelating squarate (sq2) ligands into layers parallel to (101). Interlayer hydrogen bonds strengthen the cohesion of the threedimensional network. The samarium cation is coordinated by four O atoms from sq1 units and three O atoms from sq2 units, in addition to two water O atoms. The best representation of the samarium SmO 7 (H 2 O) 2 polyhedron is distorted tricapped trigonal-prismatic. The sq1 ligand has one metalfree O atom and relates three Sm atoms in a bis-monodentate and chelation fashion, the second squarate, sq2, is strictly centrosymmetric and acts as a bis-chelating ligand.
Related literatureFor lanthanide squarates, see: Trombe et al. (1988Trombe et al. ( , 1990 Petit et al. (1990
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