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2000•Angewandte Chemie International EditionRequires access

Octahedral SeO66− and Square-Pyramidal SeO54−, Two New Oxoselenate Anions

Helmut Haas, Martin Jansen

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Abstract

High-pressure techniques were applied to obtain the new oxoselenate Na4SeO5, whereas a further oxoselenate, Na6Se2O9, is also accessible under standard pressure. Both enrich the known oxoselenate(VI) ions SeO42− (tetrahedron) and SeO54− (trigonal bipyramid) by two additional anionic polyhedra, namely by a square-pyramidal pentaoxoselenate and by octahedral SeO66− ions (see picture).

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What this paper is about

High-pressure techniques were applied to obtain the new oxoselenate Na4SeO5, whereas a further oxoselenate, Na6Se2O9, is also accessible under standard pressure. Both enrich the known oxoselenate(VI) ions SeO42− (tetrahedron) and SeO54− (trigonal bipyramid) by two additional anionic polyhedra, namely by a square-pyramidal pentaoxoselenate and by octahedral SeO66− ions (see picture).

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Available abstract

High-pressure techniques were applied to obtain the new oxoselenate Na4SeO5, whereas a further oxoselenate, Na6Se2O9, is also accessible under standard pressure. Both enrich the known oxoselenate(VI) ions SeO42− (tetrahedron) and SeO54− (trigonal bipyramid) by two additional anionic polyhedra, namely by a square-pyramidal pentaoxoselenate and by octahedral SeO66− ions (see picture).

Key concepts: Octahedron, Square pyramidal molecular geometry, Polyhedron, Tetrahedron, Trigonal bipyramidal molecular geometry, Ion, Crystallography, Square (algebra)

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