The structure of Cs[NbO(C204)z(HzO)2].2H20 has been determined from three-dimensional X-ray diffractometer data. The crystals are monoclinic with a=6.464(1), b=11.8697(9), c=7.9518(3) /~, fl= 98"911(3)°; the space group is P2t/m. The coordination polyhedron around niobium is a pentagonal bipyramid. The ligands in the equatorial plane are two oxygen atoms from an oxalato group and their mirror-plane related pairs at distances of 2.104 and 2.124 /~, and one water molecule at 2.169 A. The apices of the bipyramid are occupied by the double-bonded oxygen atom and one water molecule at 1.691 and 2.328/~, respectively.
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