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2007•Acta Crystallographica Section E Structure Reports OnlineRequires access

Reinvestigation of trisodium dihydroxidotetraoxidoneptunate(VII)

Mikhail S. Grigoriev, Nikolai N. Krot

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Abstract

The title compound, Na3[NpO4(OH)2], contains complex [NpO4(OH)2]3− anions, having a distorted tetra­gonal bi­pyramidal form. The Np atom occupies a special position on a twofold axis. The Np—O distances are 1.8981 (13) and 1.9012 (12) Å in the NpO4 group and 2.3145 (11) Å to the OH groups. The main distortion of the tetra­gonal bipyramid is a shift of the O atoms of the OH groups from ideal positions, the corresponding O—Np—O angle being 173.80 (7)°. The orientation of the OH groups differs significantly from the centrosymmetric arrangement found in other compounds with [NpO4(OH)2]3− anions.

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What this paper is about

The title compound, Na3[NpO4(OH)2], contains complex [NpO4(OH)2]3− anions, having a distorted tetra­gonal bi­pyramidal form. The Np atom occupies a special position on a twofold axis. The Np—O distances are 1.8981 (13) and 1.9012 (12) Å in the NpO4 group and 2.3145 (11) Å to the OH groups. The main distortion of the tetra­gonal bipyramid is a shift of the O atoms of the OH groups from ideal positions, the corresponding O—Np—O angle being 173.80 (7)°. The orientation of the OH groups differs significantly from the centrosymmetric arrangement found in other compounds with [NpO4(OH)2]3− anions.

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Available abstract

The title compound, Na3[NpO4(OH)2], contains complex [NpO4(OH)2]3− anions, having a distorted tetra­gonal bi­pyramidal form. The Np atom occupies a special position on a twofold axis. The Np—O distances are 1.8981 (13) and 1.9012 (12) Å in the NpO4 group and 2.3145 (11) Å to the OH groups. The main distortion of the tetra­gonal bipyramid is a shift of the O atoms of the OH groups from ideal positions, the corresponding O—Np—O angle being 173.80 (7)°. The orientation of the OH groups differs significantly from the centrosymmetric arrangement found in other compounds with [NpO4(OH)2]3− anions.

Key concepts: Tetra, Chemistry, Crystallography, Trigonal bipyramidal molecular geometry, Group (periodic table), Distortion (music), Stereochemistry, Atom (system on chip)

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