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The title compound, Nd2(Se2O5)3.H2SeO3.2H2O, is a new rare earth hydrogen selenite. Its crystal structure is built up of polar layers parallel to the ab plane. Each layer is formed by edge-sharing NdO9 polyhedra and bridging diselenite groups. Selenious acid and water molecules occur on only one side of the layer. The other side contains flanking diselenite groups only. A complex network of hydrogen bonds holds the layers together. The configuration of Se2O5 is defined and compared with the diselenite moieties of related compounds.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks LRSA0204, structure

hkl

Structure factor file (CIF format)
Contains datablock nd

-1
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