Acta Cryst. (2013). C69, 1503-1508 [ doi:10.1107/S0108270113031806 ]
Abstract: Three three-dimensional coordination polymers, viz. poly[[diaqua-4-oxydiacetato-di-4-sulfato-dipraseodymium(III)] hemihydrate], [Pr2(C4H4O5)(SO4)2(H2O)2]·0.5H2O, (I), poly[[diaquadi-3-oxydiacetato-3-sulfato-dineodymium(III)] 1.32-hydrate], [Nd2(C4H4O5)2(SO4)(H2O)2]·1.32H2O, (II), and poly[[diaquadi-3-oxydiacetato-3-sulfato-disamarium(III)] 1.32-hydrate], [Sm2(C4H4O5)2(SO4)(H2O)2]·1.32H2O, (III), were obtained by hydrothermal reactions of the respective lanthanide oxides and ZnSO4 with oxydiacetic acid (odaH2). The Nd3+ and Sm3+ compounds form isomorphous crystal structures in which the lanthanide cations are nine-coordinate, having a tricapped trigonal prismatic coordination. The Pr3+ compound has an entirely different crystal structure in which two types of coordination polyhedra are observed, viz. nine-coordinate (trigonal prism) and ten-coordinate (bicapped square antiprism). The sulfate anions show various coordination modes, one of which has only rarely been observed crystallographically to date.
CCDC references: 930447, 930448 and 930449
Formula: [Pr2(C4H4O5)(SO4)2(H2O)2]·0.5H2O, and Nd and Sm analogues
Keywords: crystal structure; three-dimensional coordination polymers; lanthanide structures; lanthanide sulfates.
Structure factor file (CIF format) (149.9 kbytes)
Structure factor file (CIF format) (203.1 kbytes)
Structure factor file (CIF format) (200.6 kbytes)
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