Isopoly Compounds

complex compounds; acids or salts containing a complex anion (polyanion) formed by acid oxides in which the oxygen is partly replaced by the same kind of acid oxide.

Examples of isopoly compounds include pyrosulfuric acid (H₂S₂O₇) and potassium dichromate (K₂Cr₂ O₇), the coordination formulas of which are, respectively, H₂[SO₃(SO₄)] and K₂[CrO₃(CrO₄)]. Isopoly compounds are known mostly for anions containing sulfur, tantalum, niobium, chromium, molybdenum, tungsten, and uranium. X-ray diffraction has shown that the polyanions of isopoly compounds can be represented by short chains of tetrahedra or octahedra, with common edges or ver-texes. Isopoly compounds are prepared either by melting normal salts with acid oxides (for example, Na₂WO₄ + WO₃ = Na₂W₂O₇) or by acidifying aqueous solutions of neutral salts (2K₂CrO₄ + H₂SO₄ = K₂Cr₂O₇ + K₂SO₄ + H₂O). Isopoly compounds are used in analytical chemistry.

REFERENCES

Grinberg, A.A. Vvedenie v khimiiu kompleksnykh soedinenii, 3rd ed. Moscow-Leningrad, 1966.
Cotton, F., and G. Wilkinson. Sovremennaia neorganicheskaia khimiia, part 3. Moscow, 1969. (Translated from English.)

单词	isopoly compounds
释义	Isopoly Compounds Isopoly Compounds complex compounds; acids or salts containing a complex anion (polyanion) formed by acid oxides in which the oxygen is partly replaced by the same kind of acid oxide. Examples of isopoly compounds include pyrosulfuric acid (H₂S₂O₇) and potassium dichromate (K₂Cr₂ O₇), the coordination formulas of which are, respectively, H₂[SO₃(SO₄)] and K₂[CrO₃(CrO₄)]. Isopoly compounds are known mostly for anions containing sulfur, tantalum, niobium, chromium, molybdenum, tungsten, and uranium. X-ray diffraction has shown that the polyanions of isopoly compounds can be represented by short chains of tetrahedra or octahedra, with common edges or ver-texes. Isopoly compounds are prepared either by melting normal salts with acid oxides (for example, Na₂WO₄ + WO₃ = Na₂W₂O₇) or by acidifying aqueous solutions of neutral salts (2K₂CrO₄ + H₂SO₄ = K₂Cr₂O₇ + K₂SO₄ + H₂O). Isopoly compounds are used in analytical chemistry. REFERENCES Grinberg, A.A. Vvedenie v khimiiu kompleksnykh soedinenii, 3rd ed. Moscow-Leningrad, 1966. Cotton, F., and G. Wilkinson. Sovremennaia neorganicheskaia khimiia, part 3. Moscow, 1969. (Translated from English.)
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