title: Reinvestigation of tris-odium dihydroxido-tetra-oxidoneptunate(VII) dihydrate.
abstract: The title compound, Na(3)[NpO(4)(OH)(2)]·2H(2)O, contains distorted tetra-gonal-bipyramidal centrosymmetric [NpO(4)(OH)(2)](3-) complex anions. The Np-O distances are 1.8975 (7) and 1.8891 (7) Å in the NpO(4) group and 2.3451 (7) Å to the OH group. Both Na atoms (one in a general position, the second in a special position on an inversion centre) have a distorted octahedral oxygen environment.
authors.affiliation: A. N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, 31 Leninsky prospekt, 119991 Moscow, Russian Federation.
authors.forename: Mikhail S
authors.initials: MS
authors.lastname: Grigoriev
authors.forename: Nikolai N
authors.initials: NN
authors.lastname: Krot